Scroll past the last paragraph of almost any Wikipedia article about a person or a company, and a row of blue links waits at the bottom of the page — easy to miss, and just as easy to misread. Those are categories: Cities in Ontario, 21st-century American businesspeople, Companies based in Lisbon. They exist to group articles that share something, not to collect every fact that happens to be true about the subject.
The rule that decides what qualifies has a name editors invoke often and newcomers rarely hear until it's used against them: WP:DEFINING. A category has to reflect a characteristic that independent, reliable sources consistently use to describe the subject — nationality, occupation, the industry a company competes in. A fact can be accurate and fully sourced and still fail that test, because the guideline asks a narrower question than whether something happened: whether sources treat it as part of the subject's identity.
A category should reflect an essential, defining trait — something independent sources treat as settled and keep repeating about the subject, not any fact that merely happens to be true.
The gap shows up most often around prize lists and conference rosters. A founder named to a magazine's annual 'thirty under thirty' feature, or invited onto a stage at a conference that accepts far more applicants than its marketing suggests, is telling the truth once a source confirms it happened. Whether either fact belongs in a category is a separate question, and the usual answer is no — not because the honor is invented, but because no body of independent writing treats it as central to who the subject is. Editors who patrol these categories tend to name the pattern the way WP:OCAT already does: a trivial intersection, true of thousands of people, that adds a line to a biography without adding to a reader's understanding of it.
Removing a category from one article needs no committee and no vote. Any editor deletes the tag from the wikitext the way they'd fix a misspelling, and the edit stands or falls on its own, like any other change. A formal venue, categories for discussion, exists for the category itself — renaming it, merging it, deciding whether the whole structure should survive. A single article's membership in a category that already exists is ordinary editing, usually settled the same afternoon someone raises it.
None of this makes a category worthless when it's added correctly. A biography that genuinely spent a career in, say, Portuguese cinema helps a reader browsing for comparable subjects exactly because the category means something specific. What doesn't help is treating the category list as a second excerpt — a place to park every credential a press kit would mention, on the theory that more tags read as more prestige. An editor checking the sourcing behind a crowded category list tends to find the same pattern a crowded reference list sometimes hides: claims that are accurate everywhere except in their claim to belong.
