An LLM (Large Language Model) is an AI model trained on massive amounts of text to understand and generate natural language. It is capable of tasks such as summarization, translation, conversation, and text analysis. LLMs are based on neural networks, mostly transformer architectures, and contain billions of parameters. Popular LLMs include OpenAI’s GPT, Google’s PaLM, and Meta’s LLaMA. They are used in chatbots, AI assistants, search engines, and content tools.