ChatDev is an innovative open-source framework that revolutionizes software development by leveraging large language models (LLMs) and multi-agent collaboration. It simulates a virtual software company where AI agents with different roles (e.g., CEO, CTO, programmer) work together to design, code, test, and document software based on natural language descriptions. ChatDev aims to democratize software creation, making it accessible to non-programmers while enhancing efficiency for experienced developers.