ChatGPT is a language model developed by OpenAI. It is based on the GPT-3.5 architecture and designed to interact with users through natural language conversations. It has been trained on vast amounts of text from the internet, allowing it to generate human-like responses to various prompts. ChatGPT is capable of understanding context, answering questions, providing explanations, engaging in creative writing, and much more. Its versatility makes it useful for a wide range of tasks, from chatbot applications to aiding in content creation and assisting with research.