Perplexity AI is an AI-powered search engine and research assistant that combines the power of large language models with real-time web search to deliver accurate, cited answers to complex questions. It represents a new paradigm in information retrieval, providing conversational search with transparent sourcing.

Unlike traditional search engines that return links, Perplexity synthesizes information from multiple sources to provide direct, comprehensive answers with inline citations. Users can verify claims by clicking sources, making it ideal for research, fact-checking, and learning about current events.

Key features include real-time web search, academic paper search through Copilot mode, focus modes for specific source types (YouTube, Reddit, academic), follow-up questions for deeper exploration, and shareable search threads. Pro users get access to more powerful models and enhanced capabilities.

Perplexity offers free access with limited daily searches and Pro subscriptions for power users needing unlimited queries, file uploads, and API access. It's become essential for researchers, journalists, students, and professionals who need accurate, up-to-date information with verifiable sources.