What Are Keywords in SEO
Keywords are the words and phrases people type into search engines that your page aims to match, helping search engines connect content to relevant queries.
If you have ever stuffed exact-match keywords into copy and still failed to rank, you already know relevance and intent matter more than repetition.
Key points
- Target one primary keyword and several related secondary keywords per page, not a dozen unrelated terms.
- Long-tail keywords often signal clearer intent and lower competition than broad head terms.
- Write for the topic, not the exact phrase — Google uses semantic understanding, not keyword density.
- Group keywords by search intent so one page can satisfy a cluster of related queries.
- Revisit your keyword research as query patterns and competition change; old choices can become irrelevant.
One page, three keywords, one intent
A recipe site writes a page about 'gluten-free chocolate cake'. The primary keyword is 'gluten-free chocolate cake recipe'. Secondary keywords include 'easy gluten-free cake' and 'best gluten-free chocolate cake'. Long-tail keywords like 'gluten-free chocolate cake for beginners' also appear naturally. The page ranks for all three because they share the same search intent — someone looking for a recipe — and the content covers the topic thoroughly without repeating any phrase.
Three things keywords are not
- Not a ranking guarantee A keyword tells a search engine what your page is about, but it does not force a high rank. Relevance, authority, and user experience also matter.
- Not single words only Most keywords are phrases of two or more words. Targeting single words alone misses the context and intent behind the query.
- Not a density target Modern SEO does not measure how many times a keyword appears. Repeating a phrase does not improve ranking and can harm readability.
Four ways keyword usage goes wrong
- Targeting unrelated keywords Putting multiple unrelated keywords on one page confuses search engines and dilutes topical relevance. Each page should focus on one clear topic cluster.
- Ignoring search intent A keyword like 'buy running shoes' signals transactional intent. Writing an informational article for that query will not satisfy the searcher or rank well.
- Forgetting related terms Google uses semantic understanding. If you omit related and supporting terms, your page may miss signals that help it rank for the full topic.
- Treating keywords as static Query patterns and competition change. Keyword research done once and never revisited can leave your content targeting outdated or irrelevant terms.
Three things to check before choosing a keyword
- Search volume and competition High-volume keywords often have strong competition. A mix of head terms and long-tail keywords can balance reach with realistic ranking chances.
- Intent match Does the keyword match what your page offers? Informational, navigational, commercial, and transactional intents each require different content approaches.
- Topical coverage Can you cover the topic thoroughly? A keyword that demands shallow content may not satisfy users or search engines expecting depth.
Common questions
What is SEO?
SEO stands for search engine optimisation — the practice of improving pages to rank higher in search results and attract relevant traffic.
What is keyword research in SEO?
Keyword research is the process of finding and evaluating search terms people use so you can create or optimise pages around demand, intent, and competition.
What are long-tail keywords?
Long-tail keywords are specific, multi-word phrases that target narrower intent and typically have lower search volume and competition than broad head terms.
Sources
- Google Search Central Official documentation on how Google understands and ranks content.
- Moz — What Are Keywords & Why Are They Important for SEO? Beginner-friendly guide covering keyword basics and best practices.
- Semrush — What are keywords? Detailed explanation of keyword types and how to use them in SEO.
- Yoast — What is a keyword? Practical advice on choosing and using keywords in on-page SEO.