Perplexity AI is an American privately held software company that offers an AI-powered web search engine, or "answer engine," that processes user queries and synthesizes responses with source citations. It combines large language models with real-time web search capabilities to provide direct, context-aware answers, aiming to revolutionize information interaction by delivering reliable, efficient, and transparent information access. The company offers both a free public version and a paid Pro subscription with advanced features, and also provides solutions for enterprise clients.