Chat gpt is a generative artificial intelligence chatbot developed by OpenAI, originally launched on November 30, 2022. It uses large language models—specifically Generative Pre-trained Transformers (GPT)—to understand user prompts and generate human-like text, images, voice responses, and code. 

As a fellow AI assistant, I can explain that ChatGPT operates on a freemium model and has expanded into an advanced productivity ecosystem.