Glossaire · SEO

Keyword

A keyword is the word or phrase a user types into a search engine to find information, a product or a service. In SEO, a keyword refers to the target query around which a page is optimized so it can appear in search results. There are three broad keyword families: head keywords (one or two words, high volume, high competition), mid-tail keywords, and long-tail keywords (specific phrases, low volume, clear intent). Every keyword carries a search intent — informational, navigational, commercial or transactional — which dictates the type of content to produce. Identifying the right keywords means aligning a site's content with the way its audience actually phrases its needs, an essential condition for generating qualified, lasting organic traffic over time.

How a keyword works in SEO

A keyword acts as a bridge between a user query and a web page. When someone types a phrase, the search engine matches that query against indexed content to surface the most relevant pages in the SERP. The SEO job is to anticipate these queries, measure their search volume and difficulty, then structure content to answer the expressed intent precisely.

Keywords are classified by length and specificity: head queries ("shoes") capture high volume but convert poorly, whereas long-tail phrases ("waterproof women's trail running shoes") attract fewer people but far more qualified visitors.

Why it matters

Choosing the right keywords shapes your entire content strategy. Targeting overly competitive terms wastes resources; chasing zero-volume queries produces useless pages. The challenge is to balance opportunity against feasibility while respecting the search intent behind each query.

Key takeaway

A keyword is not just a phrase to repeat: it is the expression of a need. Optimizing for the need, not the term, is what separates durable SEO from penalized keyword stuffing.

A concrete example

For a local agency, the keyword "SEO agency Albi" combines commercial intent with geolocation: low volume, but visitors ready to get in touch. Conversely, "what is SEO" signals informational intent that calls for an educational article rather than a sales page. A complete keyword map thus distributes each query across the right page type, from blog posts to service pages.

FAQ

Frequently asked questions

A page should target one primary keyword and a few close semantic variants that share the same search intent. Stacking unrelated keywords dilutes the signal and triggers cannibalization between your own pages.

Search volume measures the number of monthly queries, while difficulty estimates the effort required to rank against the competition. A good keyword combines sufficient volume with a difficulty that is realistic given your site's authority.

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