In Plain English
A query is a clue, not a complete biography. Search intent is a practical model for asking what someone is trying to achieve. They may want to learn, reach a known destination, compare choices or complete an action. Those needs are often described as informational, navigational, commercial investigation and transactional. A query can overlap categories, and intent may change as someone learns. The model helps shape a useful page; it does not read a person’s mind.
Why it matters
A page can be technically excellent yet disappoint if its format, opening or next step solves the wrong task. Intent keeps content decisions tied to visitor needs rather than keyword repetition.
Use the categories as questions. Does the visitor need an explanation, a particular destination, evidence for comparing choices, or a clear way to act? Look at the wording, context and formats that genuinely help, then make the page opening confirm the task. One page does not need to serve every possible intent. A focused answer with a sensible onward route is usually more usable than a page trying to be guide, comparison and checkout at once.
Example
“How does indexing work?” is likely informational, while “buy SEO guide” suggests transactional intent.
Common misunderstanding
Intent categories are useful models, not permanent labels or certainty about an individual person.