ChatGPT is an advanced AI language model developed by OpenAI, capable of generating human-like text responses through natural language processing. It builds on the Generative Pre-trained Transformer (GPT) architecture, with various versions (GPT-1 to GPT-4) enhancing capabilities like context understanding, content generation, and ethical considerations. Key applications include integration with established brands for tasks like content creation, customer support, and workflow management across multiple industries.