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What Is a Large Language Model (LLM)?

LLMs are AI systems like ChatGPT and Claude trained on billions of words to read and write like humans. They power chatbots, writing assistants, and coding tools. Knowing how LLMs work helps you write better prompts and understand why AI sometimes makes mistakes.

ChatGPT, Claude, and Gemini are all LLMs. They learned language by reading most of the internet — books, articles, code, conversations. They predict the most likely next word, over and over, which creates surprisingly coherent responses. They don't truly 'understand' like humans do, but they're incredibly useful for writing, summarizing, coding, and answering questions.

**Key takeaway:** LLMs are AI trained on text that can read and write like humans.

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