RankWiki

Keyword Research

What Are Keywords in SEO

Keywords are the words and phrases people type into search engines, and the topics a page targets to match those queries.

Also called
search queries, SEO keywords, target terms
Applies to
on-page content, titles, meta descriptions, heading tags, URL structure
Commonly confused with
search intent, semantic topics, keyword density

Key points

  • Keywords connect what users search for with the content a page provides.
  • A single page typically targets one primary keyword plus several related secondary keywords.
  • Long-tail keywords are longer phrases that often indicate clearer search intent.
  • Modern SEO prioritises topical relevance over exact-match repetition.
  • Keyword research should be revisited regularly as query patterns and competition change.

How it works

When a user types a query into a search engine, the engine scans its index for pages whose content, titles, and structure best match that query. Keywords bridge the gap between what the user asks and what the page covers.

A page may target one primary keyword (the main topic) and several secondary or related keywords. These terms appear naturally in headings, body copy, and meta elements, but Google now evaluates the overall topic rather than counting exact matches. Related terms, synonyms, and context help the engine infer relevance without repeating a phrase.

Long-tail keywords work the same way but are more specific — for example, 'buy organic coffee beans in London' instead of 'coffee'. These phrases often have lower search volume but higher conversion potential because they reflect a clearer intent.

Keyword usage evolves with search intent and SERP features; older advice about density or exact-match repetition can be misleading.

Why it matters

Without keywords, search engines cannot determine what a page is about, making it invisible for relevant queries. With proper keyword research, a site can attract traffic from people actively looking for its content, products, or services.

Keywords also shape the entire seo strategy: they guide which topics to write about, which words to use in titles, and which supporting terms to include. A page that aligns with search intent through well-chosen keywords ranks higher and retains visitors longer than one that uses random or forced terms.

Ignoring keywords leads to content that competes for the wrong queries, wastes resources on terms with no traffic potential, or fails to satisfy users because the page does not match what they meant.

Where it changes your decision

  • Choosing a page topic: you pick a primary keyword that has enough search volume and relevance, then build content around it.
  • Writing titles and headings: you include the primary keyword early in the title and in one H1 or H2, but write for the reader first.
  • Deciding on supplementary terms: you research related keywords and use them naturally in subheadings and body copy to cover the topic thoroughly.

What it is not

  • Keywords are not just single words: they include phrases of two or more words, which often reflect actual search behaviour better.
  • Keywords are not a popularity contest: a high-volume term may be too competitive or not match intent; relevance and context matter more.
  • Keywords are not something to stuff: repeating an exact match over and over harms readability and can trigger a penalty; modern SEO relies on topical coverage.
  • Keywords are not isolated from search intent: the same keyword can mean different things depending on what the user wants to do (buy, learn, navigate).
Read next SEO Strategy After understanding what keywords are, the next step is to build a full seo strategy that turns those keywords into a plan for content, structure, and measurement.

Questions people ask

What is SEO?

SEO stands for search engine optimisation. It is the practice of improving a website to increase its visibility in unpaid search engine results, primarily through relevant content and technical adjustments.

What is SEO and how it works?

SEO is the process of making a website more findable in search engines. It works by helping search engines understand, index, and rank pages so they appear for relevant queries, using signals like keywords, links, and site structure.

What is SEO in digital marketing?

In digital marketing, SEO refers to strategies that attract organic traffic from search engines. It is a core channel because it brings users who are actively searching for what a business offers, often with higher intent than social or display advertising.

On-Page & Content SEO SEO Strategy An SEO strategy is a structured plan for improving a site's organic visibility by aligning… On-Page & Content SEO SEO Optimization SEO optimization is the process of improving a website's content, structure, and technical… Keyword Research Long-tail Keywords A long-tail keyword is a specific, usually multi-word search phrase that targets a narrower… Keyword Research Semantic SEO Semantic SEO is the practice of optimising content around meaning, context, entities and user… Keyword Research SEO Tips SEO tips are practical actions that help a page become easier for search engines to crawl… Keyword Research Keyword Optimization Keyword optimization is the practice of aligning page content, titles, headings, and other…

Sources

  1. Google Search Central Google’s official documentation is the most authoritative source for how search works and how Google recommends creating helpful, relevant content.
  2. Moz — What Are Keywords & Why Are They Important for SEO? Clear beginner-friendly definition of keywords as topics and search queries.
  3. Semrush — What are keywords? Useful for keyword clustering, intent grouping, and practical SEO usage.
  4. Yoast — What is a keyword? Concise SEO-focused definition and page-targeting explanation.

Written and maintained by Nora Lindholm. Last updated 27 July 2026.

Spotted an error? Email me — corrections are logged and credited on the entry. Outbound links are unpaid; most are nofollow.