ChatGPT is an advanced AI chatbot developed by OpenAI, designed to understand and generate human-like responses in natural language. It’s based on GPT (Generative Pre-trained Transformer) models, specifically GPT-3.5 and GPT-4, which are trained on massive datasets from books, websites, and conversations. The name "ChatGPT" combines “chat,” meaning conversation, with “GPT,” the technology behind it.