What Perplexity is and where things live

• Perplexity is an answer engine. You type a question, it searches the live web, and it writes an answer with numbered citations that link to the pages it used.
• Free and Pro are personal plans you sign up for yourself. Enterprise Pro is a company plan your admin invites you to, and its data is never used to train models.
• Go to perplexity.ai and sign in with Google, Apple or your email. There are no passwords: email sign-in sends you a link or a one-time code.
• The home page has one search box. Each question starts a session (older help pages call it a thread). Follow-up questions stay in the same session.
• History in the sidebar lists your past sessions. + Attach in the search box adds a file to your question.