SEO (search engine optimization) is the work of making a website easy for search engines to crawl, understand and trust, so its pages appear when potential customers search for what the business offers. It rests on three parts: a technically healthy site, content that matches what searchers want, and authority earned from other websites. Results build over months, and they should be measured in qualified traffic and enquiries, not rankings alone.
How search engines decide what to rank
Google handles every page in three stages. First it crawls the web, following links and sitemaps to discover pages. Then it indexes them, reading the text, images and structured data to work out what each page is about. Finally it ranks indexed pages for each search, choosing the results it judges most relevant and helpful for that query, location and device.
A page that cannot be crawled or indexed cannot rank, however good its content is. That is why SEO work starts with technical checks before any new content is written.
The three pillars of SEO
Technical SEO
Technical SEO makes sure search engines can reach and process the site. It covers crawlability, indexing rules, XML sitemaps, canonical tags, redirects, HTTPS, mobile usability, page speed and structured data (schema markup). Most of this work is invisible to visitors but removes the ceiling on everything else.
On-page SEO and content
On-page SEO aligns each page with one clear search intent. That means a descriptive title tag and H1, headings that answer the questions searchers ask, useful internal links and content that covers the topic accurately. Choosing which keyword each page targets is part of this work, so pages do not compete with each other.
Off-page authority
Off-page SEO is about signals from outside the site, mainly links and mentions from relevant, reputable websites. A small number of genuine links from respected sources in the same industry carries more weight than many links from unrelated or low-quality sites.
Core Web Vitals: the performance standards Google publishes
Core Web Vitals are three metrics Google uses to measure real-world page experience. Google defines a “good” result as:
- Largest Contentful Paint (LCP): the main content loads within 2.5 seconds.
- Interaction to Next Paint (INP): the page responds to taps, clicks and key presses within 200 milliseconds.
- Cumulative Layout Shift (CLS): a layout-shift score of 0.1 or less, so content does not jump while loading.
These are measured on real visits, at the 75th percentile, separately for mobile and desktop. Google’s core ranking systems take page experience into account, but good scores do not outrank more relevant, more helpful content. Speed is a tie-breaker and a conversion factor, not a substitute for useful pages.
What E-E-A-T means for your content
E-E-A-T stands for experience, expertise, authoritativeness and trustworthiness. Google uses it to describe the qualities its systems try to reward, and trust is the most important of the four. E-E-A-T is not a single ranking factor that can be switched on. It shows up in practical details:
- Named authors or a clear business identity behind the content.
- Accurate, specific information instead of generic summaries.
- First-hand experience, such as real examples, processes and photos.
- Easy-to-find contact details, policies and pricing information.
Google applies higher standards to topics that can affect health, finances or safety, often called YMYL (Your Money or Your Life) topics.
How long SEO takes, and what affects it
There is no fixed timeline, because results depend on the starting point. The main factors are:
- Competition: a local service term in one city usually moves faster than a national term contested by large brands.
- Site history: an established domain with clean technical health responds faster than a new or penalised one.
- Scale of the problems: fixing a crawl or indexing error can show impact quickly, while building authority takes longer.
- Consistency: SEO compounds when technical upkeep, content and link earning continue month after month.
Google notes that after a site improves, some changes can show within days, while it can take several months for its systems to recognise that a site as a whole has become more helpful.
How to measure SEO properly
Rankings for a handful of keywords are a narrow view of progress. A complete SEO report should track:
- Impressions and clicks from Google Search Console, showing how often pages appear and get chosen.
- Click-through rate, which reveals whether titles and descriptions persuade searchers to click.
- Indexed pages and crawl errors, to catch technical problems early.
- Organic conversions in analytics: calls, form submissions, bookings or sales that came from search.
The last metric matters most. Traffic that never turns into enquiries usually points to the wrong keywords or a weak landing page.
Signs of an SEO plan worth paying for
A credible SEO provider explains what it will do, why, and how progress will be judged. Watch for these red flags:
- Promises of first-position rankings or a fixed date for results. No one controls Google’s rankings.
- Bulk link packages or private blog networks, which break Google’s spam policies and can trigger penalties.
- Reports that show only rankings, with no traffic or conversion data.
- Refusal to give you ownership of your Search Console, analytics and website accounts.
A sound plan starts with an audit, prioritises fixes by likely impact, targets keywords the site can realistically win, and reports in plain language. You can see how plans are structured on our pricing page, or read the longer explainer on what search engine optimization is.
How SEO connects to AEO and GEO
Search now includes AI-generated answers alongside the classic list of links. Answer engine optimization (AEO) structures content so it can be lifted as a direct answer, and generative engine optimization (GEO) works on how AI assistants describe and cite a brand. Both depend on the same foundation SEO builds: crawlable pages, clear answers and a trustworthy reputation. If you are weighing SEO against paid search, our SEO vs PPC comparison sets out the trade-offs.