What is SEO?
SEO stands for search engine optimisation. It is the process of improving a website so that search engines can understand it, trust it and show it to the right people in search results.
At its simplest, SEO helps answer three important questions. What does your website offer? Who is it useful for? Why should search engines show it ahead of other websites?
Search engines such as Google look at many signals when deciding which pages to rank. These include relevance, content quality, technical performance, user experience, authority, location and how well a page satisfies the searcher’s intent.
How search engines work
Search engines generally follow three stages: crawling, indexing and ranking. Crawling is when search engines discover pages by following links and reading website files. Indexing is when they store and organise information about those pages. Ranking is when they decide which pages to show for a specific search query.
If a page cannot be crawled, it may not appear in search results. If it is thin, unclear or poorly structured, it may be indexed but struggle to rank. If it does not match what users are searching for, it may receive impressions but few clicks.
Keywords and search intent
Keywords are the words and phrases people type into search engines. They might be short and broad, such as “SEO”, or more specific, such as “SEO agency for small businesses in Barnet”.
Keyword research is not just about finding high-volume phrases. It is about understanding intent. Search intent describes what the user wants to achieve. They may want information, a comparison, a local provider, a price, a solution or a direct purchase.
A page should be built around the intent behind the keyword. For example, a blog post is ideal for answering “what is SEO?” while a service page is better for “SEO services in London”. Matching content type to intent is one of the most important SEO basics.
On-page SEO
On-page SEO covers the improvements made directly on a page. This includes titles, headings, copy, internal links, image alt text, page structure and calls to action.
A well-optimised page should have a clear topic, a useful heading structure and content that answers the user’s question better than competing pages. It should include relevant keywords naturally, but it should not be written for search engines alone.
Technical SEO
Technical SEO focuses on the health and performance of the website. It includes site speed, mobile usability, crawlability, indexability, redirects, structured data, XML sitemaps, security and fixing broken links or errors.
A technically weak website can hold back even strong content. If pages load slowly, cannot be crawled or create poor user experiences, rankings may suffer.
Content and topical authority
Content is a major part of SEO because it gives your website more opportunities to answer searches. Service pages explain what you offer. Blog posts answer questions. Case studies build proof. FAQs remove uncertainty. Location pages support local visibility.
Topical authority grows when your website covers a subject in depth. Instead of publishing isolated articles, strong SEO content should connect related topics. Internal links then connect these pages into a useful knowledge hub.
Local SEO
Local SEO helps businesses appear for searches with local intent, such as “marketing agency near me” or “SEO agency Barnet”. It includes website optimisation, Google Business Profile optimisation, local landing pages, reviews, citations and consistent business information.
For local service businesses, local SEO is often one of the highest-value areas of search marketing because it targets people who are looking for providers in a specific area.
Measuring SEO success
SEO should be measured with more than rankings. Important metrics include organic traffic, impressions, clicks, engagement, conversions, keyword movement, visibility, page performance and technical health.
The businesses that benefit most from SEO treat it as a continuous marketing channel. With the right strategy, SEO can improve visibility, increase trust and bring in better quality traffic over time.