The longer story
A large language model is a type of AI trained on enormous amounts of text data that can understand and generate human language. Large refers to both the volume of training data and the number of parameters (adjustable values) within the model, often billions. LLMs power tools like ChatGPT, Claude, and Gemini. They work by predicting what words should come next in a sequence, which turns out to be surprisingly effective for tasks like writing, summarising, translating, and answering questions.