Editing Help:Searching (section)

==== <code>articletopic:</code> ====
{{anchor|articletopic}}

This keyword allows filtering search results by topic. {{crossref|pw=y|(For possible topics see [[mw:Help:CirrusSearch/articletopic]].)}} E.g. {{kbd|articletopic:books}} will filter the search results to articles about books. {{kbd|articletopic:books{{!}}films}} will filter to articles about books or films. {{kbd|articletopic:books articletopic:films}} will filter to articles which are about both books and films.

Only mainspace articles belong to topics. Unlike most other filters, <code>articletopic:</code> also does page weighting: articles which are a stronger match for a topic will be higher in the search results (while articles which aren't about that subject at all will be removed from the result set completely).

Topic models are derived via machine learning from [[mw:ORES#Topic routing|ORES]]. Any given article receives a score on dozens of different topics, and therefore may appear under different keywords. For instance, the article on Albert Einstein may appear as a "physics" article and a "biography" article. Topic-related search data is updated weekly, so recently created articles might not show up in topic-based search queries.