Link: Perplexity
What type of AI: Search engine and Generative AI Chatbot
User account: Immediate access is available on their homepage but you can also create a free account.
What it does: Generates responses to questions and prompts, and cites sources in the response. As a bonus, you don't have to create an account or log in to use the basic features.
Where it pulls information from: Perplexity AI is a search engine so it pulls sources from the internet (including Semantic Scholar) and summarizes them.
How to use it: Perplexity is a great tool for pre-research, or even for internet searching. Just remember to evaluate your sources!