ChatGPT is a conversational AI language model developed by OpenAI. It is based on the transformer architecture and is fine-tuned on a large corpus of text data to generate human-like responses to text inputs. ChatGPT has the ability to understand and answer a wide range of questions, converse on various topics and generate coherent and informative text. The model can be integrated with various conversational platforms and can be used for applications such as customer support, personal assistants, and language translation.