Explainpaper is an AI tool that simplifies and explains complex research papers, making them easier to read and understand. Users can upload a paper and highlight confusing sections, and the tool will provide explanations using an AI model in the background. Researchers and learners can benefit from this tool by significantly reducing the time it takes to review papers and learn new concepts. The unique feature of Explainpaper is its ability to use AI to explain AI, making it a valuable resource for those studying artificial intelligence and machine learning. Users have praised the tool for its effectiveness in breaking down dense sections and helping them feel more confident in tackling complex concepts. Additionally, Explainpaper is described as a cool and fun tool, with some users stating it feels like having a reading buddy. Overall, Explainpaper is a free and convenient tool for anyone looking to become an expert in various subjects by simplifying and providing explanations for research papers.