ChatGPT is a language model developed by OpenAI. It uses machine learning techniques to generate human-like text based on the prompts given. Initially trained with a diverse range of internet text, it responds to user input by predicting the most likely next word or sentence – much like a sophisticated auto-complete function. It can be used to draft emails, write code, answer questions, create conversational agents, give a tutoring session, translate languages, simulate game characters, and much more. It’s continuously trained and updated for better performance and more safety features.