OpenAI ChatGPT is a generative artificial intelligence (AI) chatbot designed to mimic human-like conversational dialogue. Developed by OpenAI, it uses natural language processing to respond to user queries and generate various written content, including articles, essays, and code. ChatGPT is based on the GPT-3.5 and GPT-4 large language models, which are fine-tuned for conversational applications. It supports tasks such as answering questions, composing text, and engaging in interactive conversations.