SEO is the work that makes a page findable on a search engine when someone searches for what that page offers. The acronym stands for search engine optimisation. It covers three things: the content of the site, its technical structure and the reputation of the domain. The ranking that comes out of it is organic, which means you cannot buy it.
That is the glossary definition, and you will find it word for word everywhere. What most glossaries leave out is how much search actually weighs in the UK, what happens now that Google answers part of the queries itself before showing any links, and what numbers an SEO project produces when it works. Below are figures from StatCounter, Ofcom, the ONS, Pew Research Center, Ahrefs and Semrush, plus the real rankings of a client we have worked with since 2020.
What SEO means
SEO stands for search engine optimisation (spelt optimization in the US). The industry uses the acronym almost exclusively, so that is what you will see on agency sites, in job titles and in tool menus.
In the Google Search Central documentation SEO is described as the process of helping search engines understand your content and helping users find your site. It is a broad definition with one merit: it puts the two things on the same level. A page that Google reads perfectly but that answers nothing stays where it is.
The practical distinction is a different one: organic results are not paid for, ads are. On a commercial query the two sit on the same page and serve different moments of the buying decision. We come back to this later with the numbers of a real account.
How it works: the three things a search engine does
Before it can rank anything, Google has to go through three steps in order. If the first one fails, the other two never happen.
- Crawling. An automated program follows links and downloads pages. If a page cannot be reached from any link and is not in the sitemap, for Google it does not exist.
- Indexing. The downloaded content is interpreted and stored. This is where sites that put their information inside PDFs or images lose out: the file gets downloaded, but the content does not enter the index in any useful way.
- Ranking. For every query, the index is sorted on hundreds of signals. This is the part everyone calls ranking, and we took it apart in the guide to ranking factors.
The point beginners almost always miss: SEO does not act on the third step. It acts on the first two, and the third is the consequence. If you want the detail of each phase, we wrote it up in how search engines work.
The three areas the work is split into
Every agency, every course and every tool splits SEO into the same three blocks. The names change, the content does not.
| Area | What it covers | A typical task |
|---|---|---|
| Technical SEO | Crawling, indexing, page speed, URL structure, structured data, mobile version | Removing a section from robots.txt that was blocked by mistake during development |
| On-page SEO | Content, titles, heading hierarchy, internal links, match with search intent | Splitting a single "Products" page into one page per product line |
| Off-page SEO | Links from other sites, mentions, consistency of company details on external sources | Asking for a trade fair press release to link to the page about the process, not the home page |
The three areas do not carry the same weight in every project. On a new site the technical side is sorted in a few weeks and then stops being the bottleneck. On an old site with ten years of layers it can take up half of the first year. Backlinks remain the hardest signal to build cleanly, and the data on their real weight is less clear-cut than people claim: we collected it in the article on link building.
How much organic search weighs in the UK
Most of the statistics quoted in SEO guides are American, and often five years old. UK figures exist and say one thing clearly: in the UK, being findable on search engines means being findable on Google.
| Search engine | UK share, August 2026 |
|---|---|
| 91.75% | |
| Bing | 5.67% |
| Yahoo! | 1.25% |
| DuckDuckGo | 0.71% |
| Ecosia | 0.30% |
| Yandex | 0.28% |
The audience is almost the whole adult population. According to Ofcom's Online Nation 2025 report, published on 10 December 2025, UK adults spend an average of four and a half hours online a day, Google Search is used by 82% of adults and handles around 3 billion searches a month in the UK.
On the buying side, the Office for National Statistics puts internet sales at 27.5% of total retail sales in Great Britain in 2025, and 27.3% in August 2026. Nearly three purchases in four still close offline, but a large share of them start with a search.
What has changed now that Google answers on its own
Since 2024 Google has shown an AI-generated summary above the results. It is called AI Overview and it changes the calculation SEO has relied on for twenty years, because some searchers get the answer without opening any site. Ofcom estimates that roughly 30% of UK searches now show one. These are the serious studies published so far, all on US or global data.
| Study | What it measured | Result |
|---|---|---|
| Pew Research Center, July 2025 | 68,879 Google searches made by 900 US adults in March 2025 | 18% of searches produced an AI summary. With the summary, 8% of visits included a click on a result; without it, 15%. 1% clicked a source cited inside the box |
| Ahrefs, April 2025 | 300,000 informational keywords, March 2024 vs March 2025 | Position one CTR falls by 34.5% when an AI Overview appears |
| Semrush, July 2026 | Over 600,000 keywords, US desktop database, November 2025 vs April 2026 | +71% of SERPs with an AI Overview on commercial-intent queries, -5% on transactional ones. In finance, +231.25% |
| Similarweb, August 2026 | Traffic to generative AI platforms, June 2025 to May 2026 | 9.5 billion monthly visits, +70% in a year. ChatGPT's share of the total falls from 76% to 53%, Gemini rises to 27-28% |
Two warnings before you use these numbers in a meeting. First: they are US figures, and there is no comparable public click-through study for the UK yet, so read them as a direction, not as a measure of your own market. Second: the Pew sample is 900 people, small for a figure quoted this often.
The sensible reaction is not to stop doing SEO. It is to move the target: the goal used to be position one, now it is to be the source the box cites and that ChatGPT or Gemini names when someone asks for a supplier. The work underneath is almost the same, the checks change. We have set out the method in the articles on how AI Overviews work, on generative engine optimisation and on how to appear in ChatGPT answers. The aggregate numbers are in our SEO and AI statistics.
What numbers SEO produces when it works
SEO guides almost always end without a single measured result. This is ours, on a project that started in 2020: Macropix, a Milan-based manufacturer of custom LED screens, working on the Italian market. When we started, the site did not appear for any of the category keywords in its sector.
| Keyword (Italian query) | Monthly volume | Position 2020 | Position 2025 |
|---|---|---|---|
| ledwall | 4,400 | not ranking | 1 |
| maxischermi led | 880 | not ranking | 3 |
| ledwall prezzo | 720 | not ranking | 1 |
| schermo pubblicitario | 480 | 73 | 2 |
| monitor pubblicitario | 390 | 88 | 2 |
| ledwall outdoor | 260 | not ranking | 1 |
| schermo led wall | 260 | 46 | 1 |
| totem led | 260 | 31 | 3 |
| ledwall indoor | 210 | not ranking | 1 |
The row we talk about most is not number one for "ledwall". It is "monitor pubblicitario" (advertising monitor): from position 88 to position 2. Position 88 means page nine of Google, in other words zero traffic. There was no technical shortcut: there was a well-written page on a subject the company genuinely had something to say about.
In July 2026, across the ledwall keyword cluster, macropix.it has a share of voice of 25.55% against 18.08% for amazon.it (source: Semrush). A manufacturer ahead of Amazon on the keywords of its own category is the most direct way to explain what you buy when you invest in an SEO strategy: not generic visits, but ownership of a vocabulary. The full method is in the article on SEO for manufacturers, and the same reasoning applied to B2B in general is in the guide to B2B SEO strategy.
How long before you see anything
Google, in its starter guide, says some changes can take effect in a few hours and others take several months, and suggests waiting a few weeks before judging a change. It is the most honest answer available, and it explains why nobody serious can promise a date.
In practice the timing depends on the type of work. A technical fix that unblocks indexing shows in days. A new page on a low-competition query reaches page one in a few weeks. Owning a category vocabulary, like the table above, takes years: those nine keywords took five. The detail, with the variables that lengthen or shorten the timeline, is in how long SEO takes to show results.
SEO and Google Ads answer two different questions
The most common confusion is between SEO and SEM. SEM covers everything done on search engines, including the paid side; SEA, which most businesses simply call Google Ads, is only the paid side. SEO is the other half.
On the same Macropix account, between July 2025 and June 2026, Google Ads produced 374 conversions from €16,805 of spend: €44.93 per conversion, an average CTR of 3.59% and an average CPC of €0.81. Compared with the previous twelve months, conversions grew by 84.2% and cost per conversion fell by €11.77.
The comparison helps to frame SEO. The organic positions in the table have no cost per click, but they took years to build. Ads bring in leads from day one and stop the day you switch off the budget. With long sales cycles they work together, and we have written about how they fit in SEO and Google Ads: how to make them work together.
What you can do yourself, for free
Four things that need no paid tool and that, on the sites we see, produce more than any sophisticated intervention.
- Open Google Search Console and filter the queries where you appear in positions 8 to 20. Those are the pages one step away from page one, and that is where the work pays off first.
- Read your last fifty enquiries and note the words customers used to describe what they wanted. Those are your keywords, written by the people who buy. It is the starting point of any serious keyword research.
- Check that every service or product line has its own page, with its own URL. A single list inside a "Products" page does not rank for any of the specific queries.
- Ask your sales team for the three questions they hear most often on the phone and answer them in writing on the site. It is the quickest way to produce SEO-friendly content that no competitor can copy, and to show the first-hand experience Google calls E-E-A-T.
The point where you need outside help is almost always the same: when the problem is no longer what to write but why well-made pages are not getting into the index, or when the keywords that matter are held by competitors with a ten-year head start. That is when it makes sense to look at a structured SEO service, and the results we bring on the projects we manage are collected on the projects page. If you first want to know how to assess whoever pitches it to you, we explained it in what an SEO agency actually does.
SEO FAQs
It is the work needed to make a site's pages appear in Google's results when someone searches for what that site offers, without paying for the position. You get there by fixing three things: the technical side of the site, the content of its pages and the links other sites point at you.
SEM covers all activity on search engines, both organic and paid. SEO is the organic part, the one you cannot buy. The paid part is called SEA and in practice almost always means Google Ads. They sit on the same results page, but they reach different moments of the buying decision.
Yes, but with a different goal. The Pew Research Center study of July 2025 shows that when an AI summary appears, the share of visits with a click on a result falls from 15% to 8%, and only 1% click a source cited in the box. The value moves from the click to the citation: generative models draw on the same well-structured pages that rank on Google, so the groundwork stays the same, while the metrics used to track it change.
Google says some changes take effect in a few hours and others take several months. A technical fix that unblocks indexing shows in days, a new page on a low-competition query in a few weeks, ownership of a whole category vocabulary in years. On the Macropix project the nine main keywords took five years to get where they are.
The part that pays off most at the start can be done yourself, with no paid tools: reading the Search Console query report, giving every service or product line its own page, writing down the questions your sales team gets asked. You need outside help when the problem becomes technical, for example well-made pages that do not get into the index, or when the keywords that matter are already held by long-established competitors.
Google. In August 2026 StatCounter gives it 91.75% of the UK market, against 5.67% for Bing and 1.25% for Yahoo!. The only other front worth covering is not a search engine but an assistant: the answers of ChatGPT and Gemini, which cite sources and which, according to Similarweb, account for 9.5 billion monthly visits worldwide.
The metric almost nobody has changed yet
Almost every company still measures SEO in organic sessions. With 1% of clicks going to sources cited inside an AI box, that number measures a shrinking share of what SEO actually does. Someone who reads your name in a ChatGPT answer and then searches for you by name two weeks later shows up in Analytics as direct or brand traffic, in other words in the wrong column.
The most effective countermeasure we have seen is also the least technological: a free-text field in the contact form that says "how did you find us". In 2026 that handwritten answer tells you more than Google Analytics does, because it is the only place where a citation inside an assistant leaves a trace. Those who started collecting it stopped cutting budget from channels that were working.
