Perplexity AI is an AI chat and search engine that uses advanced technology to provide direct answers to your queries. It delivers accurate answers using large language models and even includes links to citations and related topics. It is available for free via web browser and also on mobile via the Apple App Store. Using Perplexity AI is similar to using ChatGPT, simply give the AI a text prompt to begin your query. You can tell the AI to search from a number of different live sources, such as Reddit, Academic papers, YouTube, and the entire Internet!