ChatDev is an innovative open-source framework that transforms software development by leveraging large language models (LLMs) and multi-agent collaboration. It simulates a virtual software company where AI agents, each assigned different roles such as CEO, CTO, programmer, and more, work together to design, code, test, and document software based on natural language descriptions. ChatDev aims to democratize software creation by making it accessible to non-programmers while also enhancing efficiency for experienced developers. This collaborative approach not only streamlines the development process but also fosters creativity and innovation in building software solutions.