A language model (LLM) is a form of artificial intelligence that relies on massive amounts of textual data to understand and produce language similar to humans. LLMs learn from the data by identifying patterns, structures, and connections among words and phrases, enabling them to answer questions, compose text, and a variety of language-related tasks. They are used for tasks such as text generation, translation, and summarization. ChatGPT is an example of a LLM.