DeepSeek is an AI chatbot developed by DeepSeek, a Chinese startup founded in 2023, focused on advancing artificial general intelligence. It leverages advanced large language models like DeepSeek-V3 and DeepSeek-R1, excelling in reasoning, math, and code generation across multilingual tasks. The platform offers free access via web, mobile app (iOS and Android), and API, making it accessible for both casual users and developers.