ChatGPT is a language model developed by OpenAI, one of the leading research organizations in the field of Artificial Intelligence. It uses deep learning algorithms to generate human-like responses to text inputs. The model is trained on a large corpus of text data, allowing it to generate text that is coherent, contextually relevant, and often indistinguishable from text written by a human. ChatGPT can be used in a variety of applications, including conversational AI, language translation, question-answering, and more.