Definition:
SEO, short for Search Engine Optimization, encompasses the practices used to improve a website’s ability to be crawled, interpreted, and displayed as a relevant organic result. It addresses technical factors, content, architecture, and external signals, and does not include buying advertisements.
Its purpose is to increase visibility for searches related to the information, products, or services provided by the site. That visibility can now occur through both traditional organic links and generative features integrated into search. It does not depend on a single score or guarantee a fixed position: it changes according to the query, context, competition, and the search engine’s systems.
Table of contents
How SEO works
A search engine discovers pages through crawlers, processes their content, and decides whether they can be added to its index. When someone submits a query, its systems select and order results that they consider useful for that need.
SEO supports each of these stages: it makes important resources accessible, helps the engine interpret structure and content, and improves the signals used to connect a page with search intent. It may also work on how the result appears in the SERP, although the search engine ultimately decides which title, snippet, and features to display.
SEO, AI Overviews, and GEO
Search results are no longer limited to a list of links. An AI Overview can synthesise information from several sources and provide supporting links within Google. Depending on the query and format, it may satisfy part of the need without a click, move other results further down the page, or create new routes to the linked sources.
GEO can be understood as an evolution and extension of SEO because it shares the same foundation: an accessible website, clear content, understandable structure, well-defined entities, and trust signals. It extends the objective from appearing in ranked results to helping a source be interpreted, selected and, when the system supports it, cited or linked by generative engines.
GEO does not replace SEO or guarantee inclusion in an answer. Generative visibility still depends on whether the content can be discovered and retrieved, how well it addresses the query, the quality of the information, and decisions made by each system. A current strategy therefore needs to observe traditional organic results alongside AI Overviews and other AI answer environments.
Main areas of SEO
The distinction between internal and external work remains useful, but current SEO is commonly organised into three related areas:
- Technical SEO: Supports crawling, rendering, and indexing through accessible architecture, correct HTTP responses, performance, structured data, and duplicate control.
- On-page SEO: Works on the content and elements of each page, including titles, headings, images, internal links, and alignment with search intent.
- Off-page SEO: Covers external signals such as links, mentions, and reputation. Their value depends on relevance and legitimacy rather than accumulating links without a clear reason.
These areas influence one another. Useful content may be limited if it cannot be crawled, while a technically sound website does not gain topical relevance without information that answers searches.
Areas of application
SEO can be adapted to the type of result and market. Local SEO works on visibility connected with locations and businesses; international SEO organises languages, countries, and regional versions; and image, video, news, or product optimization addresses the requirements of those formats and search surfaces.
Needs also vary by website. An ecommerce site must coordinate categories, products, and availability; a publisher needs to manage current content, archives, and discovery; and a corporate website has to connect services, brand information, and local or international signals.
SEO strategy process
An SEO strategy connects objectives, demand, technical condition, and content. The process usually includes these stages:
- Define objectives: Establish which actions or business outcomes organic visibility should support.
- Research searches: Analyse topics, intent, and keywords to understand how demand is expressed.
- Audit the site: Find crawling and indexing barriers, architecture problems, and content gaps.
- Prioritise and implement: Order changes by impact, dependency, and resources, then apply them without harming URLs that already work.
- Develop authority: Create resources that merit references and promote them to relevant audiences and websites, while avoiding link schemes.
- Measure and iterate: Evaluate results, test assumptions, and adjust the strategy as the site, competition, and searches change.
Measuring results
Google Search Console provides impressions, clicks, queries, pages, and average position data for Google. Website analytics can then relate that traffic to interactions, conversions, or revenue.
The presence of AI Overviews can change the relationship between impressions, position, and clicks because it introduces a generative answer and new links within the results page. Its impact should be analysed across query sets and over a sufficient period, combining search data with SERP observation and cited-source monitoring. The appearance of one AI Overview does not by itself establish the cause of a traffic increase or decline.
Measurement should distinguish visibility, traffic, and business outcomes. A ranking improvement may not produce clicks when demand is low or the snippet does not answer the query well; similarly, more traffic does not necessarily mean more conversions. SEO is cumulative and requires maintenance, but it cannot guarantee indexing, rankings, or specific time frames.
Differences between SEO and SEM
SEO works on visibility in organic results and does not pay the search engine for each visit or impression. SEM, in its most common professional use, refers to search advertising campaigns that participate in auctions and generate advertising costs.
The two channels may share search research and measurement, but they operate differently. Ads can run while budget is available and the campaign meets the platform’s conditions; organic visibility depends on the search engine crawling, interpreting, and selecting pages for each query.