Perplexity AI

Perplexity is a conversational search engine. Instead of returning a list of links, it runs web searches for each question, reads the results with large language models and writes a direct answer, with numbered citations pointing to the pages it used. Users can ask follow-up questions in the same thread, upload files to query, choose between several underlying models, and launch longer research tasks that produce a structured report. Paid plans add more advanced models, and an enterprise version lets teams search across internal documents alongside the web. It is used by individuals and knowledge workers for research, fact-finding and day-to-day questions.