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Perplexity is an AI answer engine that responds to questions with a synthesised answer and inline citations to the sources it used. Instead of a list of links, you get a short, readable summary you can verify by clicking through to the underlying pages. It supports focused modes for academic papers, news and community discussions, and Pro search runs multiple follow-up queries for deeper research. Free users get a limited number of Pro searches per day; the paid plan raises limits and adds stronger models. Collections let you save and share research threads. It is most useful for fact-finding, market research and anything where you need to check where an answer came from.