Search engine optimisation (SEO) is the work of improving a website so that search engines can find it, understand it and show it to the right people in their unpaid results. The aim is not traffic for its own sake but visits from people likely to become customers.
How SEO works
Search engines crawl the web, store pages in an index and rank them for each search using their algorithms. SEO influences each step, and the work usually falls into four areas.
- Technical SEO: making sure pages can be crawled and indexed, load quickly, work on phones and are organised in a clear structure.
- Content and on-page SEO: creating pages that answer what people search for, with titles, headings and text that match the intent behind each search.
- Authority: earning links and mentions from other reputable sites, which signal that your business is trusted. This is often called off-page SEO.
- Local SEO: for businesses serving an area, being found in Google Maps and the local pack through a complete Google Business Profile, consistent details and reviews.
Underpinning all of it is keyword research: finding the words customers actually use and deciding which page should answer each one, so pages do not compete with each other.
Why it matters
Google handles the large majority of searches in the UK (see search engine market share for dated figures), and much of what people look for there leads to a purchase or an enquiry: a service near them, a product to compare, a supplier to call. Ranking organically for those searches brings visits you do not pay for per click, and good pages can keep bringing enquiries for years.
SEO also feeds newer search experiences. Google’s AI Overviews and AI Mode, along with assistants such as ChatGPT and Perplexity, draw on web pages for their answers. Clear, well-structured, trustworthy content gives your business a better chance of being cited there too.
The limits are worth stating plainly. Nobody controls Google’s rankings, and anyone guaranteeing a position is promising something they cannot deliver. Timescales depend on the competition, your site’s starting point and how much is changed; in competitive markets it is usually months before the effects are clear.
Common mistakes
- Writing content before fixing technical faults. Pages that cannot be indexed cannot rank, however good they are.
- Targeting the same phrase with several pages. This causes keyword cannibalisation and weakens all of them.
- Chasing volume over intent. A high-volume informational term may bring visitors who never buy.
- Buying cheap links. Paid link packages risk penalties and rarely help.
- Measuring rankings only. Track enquiries, calls and sales from organic search, not just positions.
How to act on it
Set up Google Search Console and GA4 so you can see what is happening. Check that your important pages are indexed and that nothing is blocking them. Then research the searches that matter for each service or product, make sure one strong page answers each, and fix titles, headings and content on those pages first. For a local business, complete and maintain your Google Business Profile in parallel. Build authority last, through work worth linking to: useful guides, local partnerships, genuine press coverage.
If you would like help deciding where to begin, my SEO services page explains each type of work and who it suits, and the SEO guide for UK small businesses walks through the process in order.