OpenAI's GPT (Generative Pre-trained Transformer) is an advanced language model designed to understand and generate human-like text. It uses deep learning techniques to analyze vast amounts of text data, allowing it to respond to prompts, answer questions, and create coherent written content across various topics. The model operates by predicting the next word in a sentence based on the context of the words that came before it. This capability enables GPT to assist in tasks such as writing, summarizing, and translating text, making it a valuable tool for individuals and businesses alike.