A Generative Pre-trained Transformer is a type of computer program that is trained to generate text. It uses natural language processing (NLP) techniques to learn how to write sentences and paragraphs in the same way that humans do. It then uses this knowledge to create brand new text that has never been written before. Generative Pre-trained Transformers are very powerful, as they can generate text that can be used for many different purposes, such as short stories, articles, and even translations from one language to another.