ChatGPT is a large language model developed by OpenAI. It is designed to generate human-like responses to natural language queries and prompts, such as questions or statements. ChatGPT uses a deep learning algorithm called a transformer to analyze and understand human language, allowing it to generate contextually appropriate and coherent responses. ChatGPT is trained on a massive dataset of human language data, which enables it to provide a wide range of responses to diverse topics and questions. It can be accessed through various platforms and applications, including web interfaces and messaging apps.