What does SEO stand for?
SEO is short for search engine optimisation — British spelling; optimization in American English. The same three letters describe a job title, a budget line and a discipline, which is part of why the term feels vague.
Mechanically, a search engine does three things, and SEO is the practice of influencing each one.
Crawling. Bots follow links to discover pages. If a page cannot be reached, nothing else matters.
Indexing. What is discovered gets stored and understood. A page can be crawled and still be left out of the index if the engine judges it thin or duplicate.
Ranking. For a given query, the engine orders the indexed pages it considers relevant, using signals such as topical relevance, links from other sites, page speed and how well the page answers the question.
Google's own starter guide documents this pipeline, and the practical implication is worth stating plainly: most SEO problems are one of these three stages failing, not a mysterious algorithmic verdict.
What SEO means in business
Strip away the jargon and SEO is a distribution channel with an unusual cost shape. You pay up front — in content, engineering and authority-building — and the traffic arrives afterwards, for as long as the page keeps ranking. Advertising is the opposite: the traffic starts the day you pay and stops the day you stop.
That shape has three consequences a business owner feels directly.
It compounds, then plateaus. A page that ranks earns links and mentions, which help it rank. The first six months usually look like nothing is happening; the second six months look like everything happened at once.
It is bought with time, not only money. You can spend more to move faster, but you cannot buy a position the way you buy a click. An agency that promises a ranking by a date is promising something it does not control.
It attracts intent, not attention. Someone searching "SEO agency for B2B software" has already decided they want one. That is a different visitor from someone who saw a banner.
The four types of SEO
Most practitioners split the work into four areas. They are not alternatives — a site needs all four, and the weakest one usually sets the ceiling.
| Type | What it covers | Typical first job |
|---|---|---|
| On-page SEO | Titles, headings, body copy, internal links, matching a page to a search intent | Rewriting titles and descriptions that describe the company instead of the query |
| Off-page SEO | Links and mentions from other sites, digital PR, earned media | Finding out who already mentions you without linking |
| Technical SEO | Speed, mobile rendering, crawlability, indexation, structured data, HTTPS | Checking which pages are actually indexed |
| Local SEO | Google Business Profile, consistent contact details, local listings and reviews | Making the address identical everywhere it appears |
Some teams add content SEO as a fifth — topic clusters, search-intent mapping and the E-E-A-T signals Google describes in its helpful content guidance: experience, expertise, authoritativeness and trustworthiness.
What SEO does not mean
Three misreadings cost more money than any technical fault.
It is not keyword repetition. Writing a phrase forty times on a page does not rank it for that phrase; since the 2022–2024 helpful content updates, it is more likely to hold the page back. Google's systems infer topic from meaning, not from counting, and in AI search keyword density has stopped being a factor altogether.
It is not a project with an end date. Competitors keep publishing and the algorithm keeps changing. A site that stops is not standing still, it is sliding.
It is not separate from the rest of your marketing. The digital PR that earns a link also earns the mention an AI model later repeats. Run in isolation, each produces a fraction of what it should.
What changes now that AI answers sit on top
The three letters have not changed meaning, but the surface has. A growing share of searches end in a generated answer rather than a click on a blue link, and three adjacent disciplines have grown up around that.
AEO — answer engine optimisation. Writing so a specific question is answered cleanly enough to be lifted into a featured snippet, a "People also ask" box or a voice result.
GEO — generative engine optimisation. Being cited or named when ChatGPT, Perplexity or Google's AI Overviews compose an answer. This depends heavily on how clearly your business is described as an entity, and on whether that description is corroborated elsewhere.
AIO — AI optimisation. The umbrella term for structuring a site and its brand signals for AI-mediated discovery.
None of them replaces the original job. A page that cannot be crawled cannot be cited either. Classic SEO gets you into the pool of eligible sources; GEO decides whether you get named from that pool.
How long it takes, and what it costs
Technical fixes often register within weeks — indexation and speed problems are the fastest wins available. Ranking movement on competitive terms is usually three to six months out, and the commercial result, leads rather than sessions, six to twelve.
Cost depends almost entirely on the starting point, which is why any figure quoted before an audit is a guess. A site with sound technical foundations and no authority needs a different budget from a site with strong links and an unreadable front end.
Frequently asked questions
What is SEO and how does it work?
SEO is the practice of improving a website so search engines rank it higher in organic results. It works by aligning content, site structure and external authority with the signals search engines use to judge relevance and quality — then measuring what moved.
What does SEO marketing mean?
SEO marketing means using organic search as a channel rather than buying placements. The visitor arrives through a result you earned, so there is no cost per click; the cost sits earlier, in the work that made the page rank.
What is an example of SEO?
A supplier publishes a guide answering a question its buyers ask before a purchase, makes the page fast and crawlable, and earns a link from a trade publication. It reaches page one for that question, and buyers researching the decision find the company without an ad being served.
What are the four types of SEO?
On-page, off-page, technical and local. On-page covers the content and HTML of a page; off-page covers links and mentions elsewhere; technical covers crawling, indexing and performance; local covers geographic visibility. Content SEO is often counted as a fifth.
Can ChatGPT do SEO?
It can draft, outline and summarise, which is useful inside a workflow. It cannot audit a site's indexation, read live ranking data, earn a link, or know what your competitors changed last month. Used as the whole strategy it produces pages that read fine and rank nowhere.
Can I do SEO myself?
For a small or local site, a good deal of it — writing clear pages, setting up Search Console, fixing titles, keeping the business profile accurate. Competitive markets are where the time cost becomes the real constraint rather than the knowledge.
Is SEO dead, or replaced by AI?
Neither. The click-through rate on a result has fallen where AI answers appear above it, which changes what success looks like, but the eligibility test has not moved: an engine still has to crawl, index and trust a page before it can rank or cite it.
What is the difference between SEO and SEM?
SEM, search engine marketing, is usually used for the paid side — ads bought against a query. SEO is the organic side of the same results page. Most businesses run both, because one buys time while the other builds equity.
How long does SEO take to show results?
Three to six months for ranking movement on terms worth having, six to twelve for that to read as pipeline. Technical corrections can show up much sooner. Anything faster than that on a competitive term is usually a term that was not competitive.
If you want to know which of the four areas is holding your own site back, a free scan will tell you in a couple of minutes — and the result is yours whether or not you work with us.
