Perplexity AI is an AI-powered answer engine that searches the web in real-time and returns cited, sourced responses rather than generic text outputs. Researchers, students, analysts, and professionals use Perplexity AI as a cited AI research tool that goes beyond standard search by synthesizing information from multiple sources and linking directly to each one. Pro Search unlocks deeper, multi-step research queries, while focus modes for academic papers, YouTube, and Reddit help users target specific content types for more relevant results. File upload analysis and API access round out Perplexity AI as a comprehensive tool for anyone who needs fast, verifiable answers backed by real sources.