Perplexity AI is a tool that combines a search engine with ChatGPT to provide real-time analysis of web information during AI-based question and answer sessions. It saves time by eliminating the need for separate internet searches and data organization. It utilizes the capabilities of GPT-4, allowing for clarifying questions and deepening the Q&A process. With a free account, users can perform multiple question and answer sessions using the GPT-4 engine. Afterwards, they can still use the regular AI and search engine combination for question and answer interactions. Perplexity AI goes beyond just a search engine and can analyze various content sources like news, papers, videos, and Wikipedia. Through Perplexity AI, users can quickly create travel itineraries, organize news briefings, develop precise recipe plans, and learn new skills. The paid version offers access to newer language models and a higher number of question and answer sessions, with an annual cost of approximately $200 USD.