Open-source framework for building multi-agent conversational AI systems. AutoGen enables multiple AI agents to chat with each other, collaborate, and solve problems through structured conversations. Features include customizable agent roles, conversation patterns, human-in-the-loop capabilities, code execution environments, and integration with various LLM providers. Perfect for complex reasoning tasks, automated coding workflows, and multi-perspective analysis. Developed by Microsoft Research for next-generation AI collaboration and autonomous problem-solving systems.