ChatGPT is a large language model created by OpenAI that has been trained on a massive amount of text data using a deep learning algorithm. The model uses this training to understand and generate natural language responses to a wide range of questions and prompts. Its purpose is to assist users in generating human-like text and providing relevant information. ChatGPT is capable of carrying out various natural language processing tasks, including language translation, summarization, question-answering, and conversation generation.