Perplexity AI, Inc., or simply Perplexity, is an American privately held software company offering a web search engine that processes user queries and synthesizes responses. Perplexity products use large language models and incorporate real-time web search capabilities, providing responses based on current Internet content, citing sources used. A free public version is available, while a paid Pro subscription offers access to more advanced language models and additional features. Perplexity AI,