SEO: Definition, Methods and 2026 Trends

SEO (search engine optimisation), or organic search, refers to all the actions that make a website visible in Google's unpaid results and, today, in the answers of generative engines. GEO (generative engine optimisation) extends it: being reused and cited in AI Overviews, AI Mode, ChatGPT or Perplexity.

This page is for the marketing manager, business leader or SEO who has to decide where to invest: scope, ranking, priorities and measurement. The basic vocabulary is gathered in our glossary of SEO concepts.

What SEO covers: technical, content, keywords and popularity

Organic SEO is not about repeating a keyword. Search engines assess the relevance, structure, performance and authority of a page. The work splits into four pillars, each covered in detail in an article of the cluster:

SEO and organic search: two names for the same discipline

The acronym SEO stands for search engine optimisation. In English, people also speak of organic search or natural search: these expressions refer to the same discipline. "Search marketing" on its own remains ambiguous, as it also covers paid search, in other words ads.

SEO covers everything that helps a search engine crawl your pages, understand their content, index them and rank them for relevant queries. Conversely, it does not include:

• buying visibility through ads, which is SEA;
• publishing content without a strategy, as publishing guarantees neither indexation nor traffic;
• "black hat" tactics that go against Google's guidelines.

Technical and content: the two on-site pillars

Before any content optimisation, make sure strategic pages are crawlable and indexable. Classic checks cover four points:

• robots directives and unintended blocking;
• consistent canonical tags pointing to the right URL;
• clean redirects without chains;
• duplicate page management (parameters, facets, print versions).

What the search engine actually sees also depends on crawling and rendering: see how Googlebot works and JavaScript rendering choices. Structured data clarifies certain elements (product, organisation, breadcrumb) but does not compensate for weak content or a slow page.

Content, for its part, must match intent and be easy to read, by humans and machines alike. The title tag, heading hierarchy and meta description are the first signals: see writing the title tag, structuring H1, H2 and H3 headings and writing the meta description. The opposite excess, made of forced repetition and near-identical pages, is covered in our over-optimisation diagnosis.

Keywords and popularity: the demand to cover and the trust to earn

Working on intent prevents off-target content. Whether informational, navigational, transactional or commercial, each intent calls for a format: guide, category page, product page, comparison. Longer, more specific queries, which are easier to win, are detailed in our long-tail guide.

Backlinks remain an authority lever, and digital PR serves SEO through mentions, provided you target credible sites close to your topic. But a strong link profile does not replace:

• content aligned with intent;
• an indexable, fast page;
• a clear value proposition.

Over-optimised anchors, systematic link buying and artificial networks, on the other hand, expose you to a manual action or to links being devalued: see diagnosing and fixing a Google penalty.

How Google ranks a page

How Google works comes down to three successive steps:

• Crawling: Googlebot discovers URLs through links and sitemaps;
• Indexation: accessible, unblocked pages are understood and stored;
• Ranking: for each query, the algorithm orders the indexed pages.

A page that is not indexed can neither rank nor be cited by a generative engine. The systems are detailed in our Google ranking guide.

Google publishes neither the list nor the weight of its criteria, and no count of criteria is worth remembering. Signals fall into four families:

• Relevance: intent match, topic coverage, clarity;
• Technical quality: accessibility, indexability, speed;
• Popularity: links, mentions, brand signals;
• Experience: mobile rendering, page stability, a light signal.

Trustworthiness is assessed through E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness), a framework used by quality raters that assigns no score to pages: see our E-E-A-T guide. Systems evolve continuously; the Helpful Content system has been part of the core algorithm since March 2024. "Hacks" therefore age badly, and three habits remain stable:

• aim for real usefulness to the reader rather than keyword stuffing;
• document each change and measure its effect, so you do not confuse cause with coincidence;
• avoid artificial patterns: bought links, duplicate content, over-optimisation.

SEO and digital marketing: where organic search fits among the levers

In a marketing plan, SEO captures existing demand, builds brand credibility and converts, provided the page is easy to navigate. The following table positions the three search levers:

SEA brings speed and control but stops when the budget stops; organic search takes time but builds an asset. The trade-off between the two is detailed in our SEO vs SEA comparison. Paid campaigns also reveal which promises convert, to be reused in organic pages.

Social media amplifies the reach of content but remains subject to platform algorithms. Outsourcing lets you move quickly or fill a skills gap (see when to call on an SEO consultant).

Where to start depending on your site type

The method is the same for every site: technical, content, popularity, measurement. The order of priorities, however, depends on the business model:

For local businesses, consistent information must also appear in Google Business Profile. On WordPress, risks come less from the CMS itself than from its ecosystem: heavy themes, too many plugins, archives indexed without value.

Whatever the site type, the architecture must serve two audiences: bots, which need to discover and understand pages, and visitors, who need to progress towards action. Three guideposts apply everywhere:

• make key pages reachable in a few clicks;
• group content by theme and intent;
• link first from already strong pages to the pages you want to push, with descriptive anchors.

Measuring: the metrics that drive decisions

Metrics must cover the full chain, from visibility to business value. Five metrics support decisions:

• Rankings, read by query group and by intent;
• Impressions, which show visibility before the click;
• Clicks and CTR, interpreted according to the SERP layout;
• Indexed pages, on which everything else depends;
• Leads or sales from organic search, split between brand and non-brand.

Search Console measures what happens in Google (queries, impressions, clicks, indexation); Google Analytics 4 measures what visitors do after the click. Their use is detailed in our Search Console guide and in choosing SEO KPIs.

Why positions four to ten come first

Clicks concentrate at the top of the page: a 27.6% click-through rate in position 1 (Backlinko, 2026). Conversely, page 2 captures only 0.78% of clicks (Ahrefs, 2025). A page already on page 1 but below the top 3 is visible; moving it up a few places pays off faster than launching a new topic. More benchmarks are gathered in our SEO statistics.

The cluster applies a single four-tier grid:

• Positions 1–3: protect the page and monitor its CTR;
• Positions 4–10: the quick wins zone, to work on first;
• Positions 11–20: strengthen content and internal linking;
• Beyond 20: revisit the target intent or the target page.

The management cadence

A single cadence avoids reacting to noise: weekly for alerts (rankings, Search Console), monthly for decisions (content, priorities), quarterly for reviewing the page portfolio. Detailed tracking, from the query basket to alert thresholds, is described in our Google ranking tracking method.

To connect an action to a result, change one lever at a time, allow time for crawling and compare page groups. Read the SERP too: a ranking gain may not increase clicks if the page ends up below an AI Overview, videos or a local pack.

Prioritise with an impact × effort × risk matrix

An audit only matters if it becomes a prioritised roadmap with a realistic sequence. The matrix crosses three criteria for each workstream:

• Impact: crawling and indexation, click gains, conversions, revenue;
• Effort: time, budget, IT dependencies, release cycle;
• Risk: regressions, side effects, traffic loss.

Applied to common workstreams, it produces trade-offs such as these:

This approach protects the pages that matter. A migration always starts with a redirect plan. To execute, group findings into deployable packages (indexation, performance, page rewrites, internal linking, content updates), give each a measurable success criterion and reassess the order each cycle.

The most costly mistakes rarely come from technical issues alone:

• chasing traffic volume with no link to leads or sales;
• publishing without a plan, leading to duplication and cannibalisation between pages;
• over-optimising pages at the expense of readability;
• letting technical debt and editorial inconsistency build up for lack of process.

GEO: what generative engines change

GEO aims to be reused and cited in the answers generated by AI Overviews, AI Mode, ChatGPT or Perplexity. These engines rely on Google's and Bing's indexes: a page that is not indexed is not cited, and SEO remains the entry condition. What changes is the value of a ranking when an answer appears above the links.

The phenomenon now affects most queries: more than 50% of Google searches display an AI Overview (Squid Impact, 2025). Being cited becomes a metric in its own right, to be tracked alongside rankings and traffic.

Structure makes the difference. Pages with an H1-H2-H3 hierarchy are cited 2.8x more often by AI (State of AI Search, 2025). Generative engines analyse pages in blocks; citability relies on a few writing habits:

• a direct answer at the top of each section, in two to five sentences;
• clear definitions and stable terminology;
• hierarchical headings, lists and tables;
• cited sources and up-to-date content.

These rules also serve the reader and traditional ranking. The full method is described in our generative engine optimisation guide, and market data in our GEO statistics.

Depending on your situation

Depending on your starting point, here is the article to open first:

• Your organic traffic is falling: read the variations before acting with site ranking analysis.
• Your site runs on WordPress: apply the Elementor SEO checklist.
• You are choosing a domain name: compare domain name extensions and the value of an exact match domain.
• Some of your content is hidden: check what Google retains with our guide to cache and hidden content.
• You want to understand click signals: sort fact from fiction with our analysis of the 2024 Google leak.
• Your audience uses Bing or Copilot: cover this index with Bing SEO.
• A provider promises fast results: spot risky practices with our black hat SEO guide.

To turn a situation assessment into a prioritised roadmap (what to fix, what to publish, in which order), a full diagnosis such as the Incremys 360° SEO & GEO audit speeds up applying the impact × effort × risk matrix.

SEO FAQ

What does SEO mean?

SEO stands for search engine optimisation. It refers to all the actions that make a website visible in the unpaid results of Google and other search engines. It covers technical work, content, keywords and popularity, and it also determines visibility in the answers of generative engines.

What is the difference between SEO and organic search?

There is no difference: SEO and organic search refer to the same discipline. SEO is the acronym, while organic or natural search describes the channel it works on. The only trap is "search marketing" used on its own, which can also mean paid search, in other words sponsored ads.

SEO or SEA: which should you choose?

The choice depends on your need: SEA buys immediate visibility, SEO builds a lasting asset. Paid suits launches, tests and seasonal peaks, but stops when the budget stops. Organic takes several months and then keeps generating visits. Most businesses combine the two, with distinct KPIs.

How long does it take to get SEO results?

SEO results build over several months, and the timeframe depends on your starting point. A site that is already indexed, with pages on page 1 below the top 3, can progress faster than a new site. Time for crawling, indexation and ranking consolidation applies to everyone: compare page groups over a consistent period.

What is GEO?

GEO, or generative engine optimisation, targets visibility in the answers generated by AI Overviews, AI Mode, ChatGPT or Perplexity. It extends SEO rather than replacing it, as these engines rely on Google's and Bing's indexes. It adds one requirement: content that is structured, sourced and easy to cite.

Is SEO still useful with AI Overviews?

Yes, SEO remains essential, because a page that is not indexed and poorly ranked is not cited by generative engines. What changes is the value of a ranking when an answer appears above the links. You therefore need to track citations alongside clicks, and look after page structure to be reused.

Where should you start if you are short on resources?

Start by checking indexation and performance for pages already generating value. Then optimise pages ranking between fourth and tenth place, and publish a limited number of pieces aligned with your offerings. The objective is to create quick wins without weakening the technical foundations.

How do you measure SEO results?

Measure a complete chain, from visibility to business outcomes. Search Console provides queries, impressions, clicks and indexed pages; Google Analytics 4 links visits to conversions. Track this data by page group and by intent, weekly for alerts and monthly for decisions.