Perplexity AI is an AI-powered conversational search engine and research assistant designed to deliver accurate, real-time answers with cited sources. Unlike traditional search engines, it summarizes web search results into a concise, conversational answer, reducing the need to click multiple links. It offers a free version and a "Pro" version that enables users to choose from top AI models (e.g., GPT-4o, Claude 3.5, Sonar). Perplexity AI is not approved for use in SD62.