What Is SEO?
What Is SEO? A Plain-English Guide for Business Owners
SEO is one of the most used and least explained terms in marketing. This guide sets out what SEO means, how it works, what the work involves month to month and how to judge it, written for the person who pays for it and not the person who sells it.
What is SEO? The short answer
SEO (search engine optimisation) is the work of making a website easier for search engines such as Google to find, understand and trust, so that it appears higher in the unpaid results when people search for what you sell. Done well, it brings a steady flow of relevant visitors without paying for each click.
- SEO earns a place in the unpaid, or organic, results. Adverts buy a place above or below them
- Search engines work in three stages: they crawl pages, index them, then rank them for each search
- The work falls into four areas: on-page, technical, off-page and local SEO
- Google says some changes show within hours and others take several months
- Nobody can buy or guarantee a number one position, and Google says so itself
What does SEO stand for, and what does it mean?
SEO stands for search engine optimisation, spelt "optimization" in American English. Google’s own starter guide describes it as "helping search engines understand your content, and helping users find your site". The term has been in use since 1997, a year before Google was founded.
The meaning is easier to see on a results page. Search for "accountant in Leeds" and Google returns a search engine results page, usually shortened to SERP. Some entries carry a "Sponsored" label and were paid for. The rest are organic results, which Google chose because it judged them the most useful answers. SEO is everything a business does to earn one of those organic places. A results page can also carry extras such as map listings, featured snippets and AI Overviews, and SEO covers those too.
An SEO, used as a noun, is a person or agency that does this work. So "we hired an SEO" and "we are investing in SEO" describe the same thing from two sides.
How does SEO work?
SEO works by removing the reasons a search engine might overlook, misread or distrust your pages. Google describes search as three stages, and a page has to pass each one in turn. A problem at an early stage makes the later ones irrelevant.
Stage 1: crawling
Crawling is how Google discovers pages. Automated programs called crawlers, the best known being Googlebot, download text, images and video from pages they find by following links and reading sitemaps. A page with no links pointing to it, or one blocked by mistake in a robots.txt file, may never be found.
Stage 2: indexing
Indexing is how Google stores what it found. It analyses the page and files it in the Google index, which is a very large database. Google is clear that indexing is not guaranteed and that not every page it processes will be indexed. Thin, duplicated or broken pages are the usual casualties.
Stage 3: ranking and serving results
Ranking is how Google chooses which indexed pages to show, and in what order, for one particular search. It happens fresh for every query, and the results change with the searcher’s location, language and device. This is the stage most people mean when they say "SEO", but it only applies to pages that were crawled and indexed first.
One point is worth knowing before you speak to any supplier. Google states that it does not accept payment to crawl a site more often or to rank it higher. Advertising with Google buys adverts. It does not buy organic positions.
What does Google look at when it ranks a page?
Google ranks pages using many automated ranking systems that work together, and it does not publish a single checklist. It does name the systems, and for a business owner they fall into five questions.
| The question Google is asking | What it looks at | What that means for your site |
|---|---|---|
| Does this page match the search? | The words on the page and the intent behind the query, using language systems such as BERT and RankBrain | Each page needs one clear topic, described in the words customers use |
| Is the content helpful and reliable? | Whether it is helpful content written for people first. Google’s shorthand is E-E-A-T: experience, expertise, authoritativeness and trustworthiness | Show who wrote it, how you know, and real detail a competitor could not copy |
| Do other sites vouch for it? | Links from other websites, analysed by link systems including PageRank | Earn mentions from real organisations in your sector and area |
| Is the page pleasant to use? | Page experience, including page speed, the three Core Web Vitals, mobile usability and HTTPS | A fast, stable page that works on a phone |
| Is it current? | Freshness systems, for searches where recent information is expected | Keep prices, dates and advice up to date |
Two details are often misreported. Google says E-E-A-T is not itself a ranking factor. It is a way of describing the qualities its systems try to reward, and Google names trust as the most important of the four. The Core Web Vitals are three measurements: Largest Contentful Paint within 2.5 seconds, Interaction to Next Paint of 200 milliseconds or less, and Cumulative Layout Shift of 0.1 or less. Interaction to Next Paint replaced First Input Delay in 2024, so any guide still quoting First Input Delay is out of date.
What are the main types of SEO?
SEO is usually divided into four types: on-page, technical, off-page and local. Some guides list three and treat local SEO as a specialism. The split matters less than knowing which one is holding your site back, because the fixes and the costs are different.
| Type of SEO | What it covers | Typical work | Who needs it most |
|---|---|---|---|
| On-page SEO | The content and HTML of each page | Page titles, headings, copy, internal links, image alt text | Every site |
| Technical SEO | Whether search engines can crawl, index and render the site | Site structure, speed, redirects, sitemaps, structured data | Large, old or recently rebuilt sites |
| Off-page SEO | Signals from outside your website | Link building, digital PR, guest posts on relevant sites, brand mentions, citations | Sites in competitive markets |
| Local SEO | Visibility in the map results and for searches with a place in them | Google Business Profile, reviews, location pages | Businesses serving a local area |
We cover each in depth on our on-page SEO, technical SEO, link building and local SEO pages. Keyword research and content sit across all four, because they decide which pages should exist in the first place.
What is SEO in digital marketing?
In digital marketing, SEO is the channel that captures demand that already exists. Social media and display advertising put a message in front of people who were not looking for it. Search reaches people at the moment they type what they want, which is why marketers treat it as a high-intent channel.
SEO marketing is the same activity described by its purpose: using organic search to win customers, not only rankings. It is often confused with two neighbouring terms.
| Term | What it means | How you pay | What happens when you stop |
|---|---|---|---|
| SEO | Earning places in the organic results | Time or fees for the work. No charge per click | Pages usually keep ranking for a while, then slip if neglected |
| PPC | Pay-per-click adverts, such as Google Ads | A fee each time someone clicks | Visits stop the day the budget stops |
| SEM | Search engine marketing. Used either for paid search alone or for SEO and PPC together | Depends on which meaning is intended | Ask the person using the term which they mean |
Neither channel is better in general. Paid search is quicker and easier to switch on and off. SEO is slower to start and cheaper per visitor once it works. Most businesses that rely on search end up using both.
Why does SEO matter for a UK business?
SEO matters because search is where most buying journeys start, and in the UK that still means Google. Statcounter put Google at 91.39% of UK search engine use in September 2026, with Bing at 6.08% and every other engine below 2%. A business that Google cannot find is invisible to most people looking for it.
Position matters within the results too. A Backlinko analysis of four million Google results found that the first organic result received 27.6% of clicks. Every result below it shares what is left.
The commercial argument is about ownership. An advert rents attention for as long as you pay. A page that ranks is an asset you own, and it can keep bringing organic traffic and enquiries with upkeep and no fee per click. That is also the honest limit of SEO: it is slow, it needs maintaining, and it cannot create demand for something nobody searches for. If your customers do not look for your service online, another channel will serve you better.
How does local SEO work?
Local SEO works on a second set of results, the map listings that appear for searches such as "dentist near me" or "plumber Headingley". Google says it orders these by three things: relevance, meaning how well a Business Profile matches the search; distance, meaning how far the business is from the searcher; and prominence, meaning how well known the business is.
You cannot change where your customers are standing, so local SEO concentrates on the other two. Relevance comes from a complete, accurate Google Business Profile with the right categories and services. Prominence comes from reviews, links and mentions from other local organisations. Google adds that there is no way to request or pay for a better local ranking.
If most of your customers come from one area, this is usually the first thing to fix. Our SEO agency Leeds page shows how it works in practice for one city.
Does SEO still work now that AI answers appear in search?
Yes. AI answers are built from the same index of web pages that SEO has always worked on. Google’s guidance for site owners says there are no additional requirements to appear in AI Overviews or AI Mode, and no special optimisations are needed. To be shown as a supporting link, a page must be indexed and eligible to appear in Google Search with a snippet.
What has changed is how the answer is assembled. Google says these features may use a technique it calls query fan-out, running several related searches across subtopics and combining what they return. A page that answers one narrow question clearly, under its own heading, has more chances to be picked up than a page that buries the answer.
You will see this sold as answer engine optimisation (AEO) or generative engine optimisation (GEO). The names are new, but the work is mostly careful SEO: clear answers, accurate facts, a named author and pages that can be crawled. Clicks from AI features are counted inside the normal Performance report in Google Search Console, under the Web search type.
What does SEO work involve, month to month?
SEO work is a repeating cycle of finding out what is wrong, fixing it, publishing what is missing and measuring the result. The jargon makes it sound more mysterious than it is. This table translates the tasks you are most likely to see on a proposal, and what you should be able to check for yourself.
| Task on the proposal | In plain English | What you should be able to see |
|---|---|---|
| SEO audit | A health check of what stops the site being found or chosen | A short list of problems in priority order, with reasons |
| Keyword research | Finding the words customers type and how often | A map showing which page targets which search |
| On-page optimisation | Rewriting titles, headings and copy so each page matches a search | A list of pages changed and what changed |
| Technical fixes | Repairing things that stop Google crawling or indexing pages | Fewer errors in Google Search Console |
| Content | Writing the pages and articles your customers search for and you do not have | New pages, live on your site |
| Link building | Earning links and mentions from other websites | The actual links, with their addresses |
| Local SEO | Improving your Google Business Profile and local reputation | More calls, direction requests and reviews |
| Reporting | Showing whether any of it brought in business | Enquiries and sales from organic search against a recorded starting point |
If a supplier cannot show you the right-hand column, ask why. Our SEO services page sets out how we structure this work, and a one-off SEO audit covers the first row on its own.
How long does SEO take, and what does it cost?
SEO usually shows early movement within weeks and commercial results over months. Google’s own wording is that some changes take effect in a few hours and others can take several months, and that you should generally wait a few weeks before judging a change. In an Ahrefs survey of more than 4,000 respondents, three to six months was the usual time to see results. In our experience, competitive terms more often take six to twelve.
How long depends on where you start. A new website with no links has to earn trust from nothing. An established site with an indexing problem can recover quickly once the problem is fixed. A local business in a quiet market will move faster than a national retailer in a crowded one.
Cost follows the amount of work, not a market rate. Market prices vary widely, and we cover them in how much SEO costs in the UK. Our own are published: plans start from £750 per month for local and early-stage SEO, £1,500 for businesses that need content and link building, and £3,000 for complex or ecommerce sites, with a one-off audit from £495. The detail is on our SEO pricing page, and the SEO ROI calculator helps you estimate whether the numbers work for your business before you spend anything.
What is not SEO? Myths and tactics to avoid
A good deal of what is sold as SEO either does nothing or breaks Google’s rules. Google publishes a list of things it believes site owners should not focus on, and a separate set of spam policies. Sites that violate those policies may rank lower or not appear in results at all.
| Claim or tactic | What Google says | What to do instead |
|---|---|---|
| "We will add your meta keywords" | Google Search does not use the keywords meta tag | Write a clear page title and description |
| Repeating a keyword as often as possible | Keyword stuffing is against the spam policies | Use the phrase naturally and cover the topic properly |
| Buying a domain full of keywords | Keywords in a domain name have hardly any effect | Choose a name customers will remember |
| "Every page must be 2,000 words" | Length alone does not matter for ranking | Write as much as the question needs |
| Buying links in bulk | Buying or selling links for ranking is link spam | Earn links through useful content and real relationships |
| Publishing hundreds of AI-written pages | Mass-produced pages with little value are scaled content abuse | Publish fewer pages that add something new |
| "Guaranteed number one on Google" | No one can guarantee a number one ranking | Ask for a plan and a baseline, not a promise |
The industry calls rule-following work white hat SEO and rule-breaking work black hat SEO. The difference is not ethical hair-splitting. Black hat tactics can work for a short time, and it is your domain, not the supplier’s, that carries the penalty when they stop working.
Can you do SEO yourself?
Yes, a business owner can do the basics of SEO without an agency, and for a small local site the basics go a long way. The tools you need to start are free. These seven checks take about ten minutes and tell you where you stand.
- Search Google for site:yourdomain.co.uk and see whether your important pages appear. If they do not, you have an indexing problem
- Search for your main service and your town in a private browser window. Note where you appear and who is above you
- Open Google Search Console, or set it up if you never have. The Performance report shows the searches that already bring people to you
- In Search Console, open the Page indexing report and read the reasons given for pages that are not indexed
- Load your site on your phone over mobile data. Count how many taps it takes to call you or send an enquiry
- Check your Google Business Profile: correct category, opening hours, services and a review from the last month
- Read your homepage as it appears in the search results. The title should say what you do and where
It is worth bringing in help when the problem is technical, when the market is competitive enough to need steady content and links, or when nobody in the business has the hours. Google’s own advice on hiring an SEO is to ask for examples of previous work, whether they follow the Google Search Essentials, and what results they expect in what timeframe. It also warns against anyone claiming a special relationship with Google. SEO consulting suits teams that want to keep the work in-house with expert direction.
How do you measure whether SEO is working?
Measure SEO by the business it brings in, then by the indicators that predict it. Rankings are the easiest number to report and the least useful on their own, because a page can rank first for a phrase nobody types.
| Measure | Where to find it | What it tells you |
|---|---|---|
| Enquiries and sales from organic search | Your analytics, call tracking or enquiry form records | Whether SEO is paying for itself. This is the number that matters |
| Clicks | Google Search Console, Performance report | How many people came from Google |
| Impressions | Google Search Console, Performance report | How often you were shown. Usually the first number to move |
| Average position | Google Search Console, Performance report | The direction of travel for the searches you care about |
| Indexed pages | Google Search Console, Page indexing report | Whether Google can store the pages you want found |
Ask for searches that include your business name to be reported separately from those that do not. Branded searches come from people who already know you. Non-branded searches are the new customers SEO is meant to find, and mixing the two can make a flat campaign look healthy.
Where to start
Run the seven checks above first. They cost nothing and will tell you whether your problem is being found, being understood or being chosen. If you would like a second opinion, request a free SEO audit and we will send a short written summary of the main thing holding your site back. If you are comparing suppliers, our guide to choosing an SEO agency in Leeds gives you a scorecard to use on all of them, including us.
01What is SEO in simple terms?+
SEO is the work of helping your website appear when people search Google for what you sell, without paying for an advert. It involves making pages easy for search engines to find and understand, and useful enough that they are worth showing.
02Is SEO free or paid?+
The clicks are free, but the work is not. You do not pay Google for organic visitors, but someone has to spend time on the site, whether that is you, an employee or an agency. Paid search is the opposite: little work, and a fee for every click.
03What is an example of SEO?+
A Leeds physiotherapist rewriting a page so its title reads "Sports physiotherapy in Leeds" instead of "Services" is a simple example of SEO. So is fixing a broken link, adding opening hours to a Google Business Profile, or publishing an article that answers a question patients keep asking.
04What is the difference between SEO and SEM?+
SEO earns unpaid positions in search results, while SEM, or search engine marketing, usually refers to paid search adverts. Some people use SEM to mean SEO and paid search together, so it is worth asking which meaning is intended.
05What are the four types of SEO?+
The four types of SEO are on-page SEO, technical SEO, off-page SEO and local SEO. On-page covers your content, technical covers how the site is built, off-page covers links and mentions from other sites, and local covers map results and nearby searches.
06How long does SEO take to work?+
SEO usually shows early signs within a few weeks and meaningful results in three to six months, with competitive markets taking six to twelve. Google says some changes take effect in hours and others take several months.
07How much does SEO cost in the UK?+
SEO cost depends on the size of the site, the competition and how much content and link building is needed. Most agencies do not publish prices. Ours start from £750 per month, with a one-off audit from £495.
08Can anyone guarantee a number one ranking on Google?+
No. Google states plainly that no one can guarantee a number one ranking, and it advises caution with any supplier who claims to. A trustworthy supplier will commit to the work, the reporting and a realistic timeframe instead.
09Do I need SEO if I already run Google Ads?+
Usually yes, because the two do different jobs. Google Ads brings visits for as long as you pay for them, and advertising does not improve your organic rankings. SEO builds visibility that continues without a fee per click, which lowers your reliance on the advertising budget over time.
10Is SEO a one-off job or ongoing work?+
SEO is ongoing, although the heaviest work is usually at the start. A one-off audit and round of fixes can solve technical problems for good. Rankings in competitive markets need continued content, links and upkeep, because competitors keep improving and information goes out of date.
11Which SEO tools does a small business need?+
A small business needs two free tools to begin with: Google Search Console and a Google Business Profile. Search Console shows which searches bring visitors and which pages are indexed. Paid tools become useful later, for competitor research and tracking many keywords.
12Does SEO work for a brand new website?+
Yes, but a new website takes longer because it has no links, history or reputation. Start with a small number of well-made pages aimed at specific, less competitive searches, and a complete Google Business Profile if you serve a local area.
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