Perplexity AI

Perplexity is an AI-powered answer engine that responds to questions with cited, up-to-date information from the web. Results appear as a concise answer followed by numbered sources, so users can verify claims and click through to the originals. It supports follow-up questions in threaded conversations, and a paid tier adds access to more advanced models for deeper reasoning and file uploads. Students, researchers, and professionals use it for quick research synthesis where traditional search would require reading many pages.