What Is a Prompt in AI?
In AI, a prompt is the input — usually text, sometimes images or files — that a person gives a generative AI model to tell it what to do. The prompt can be a question, an instruction, examples, or background information, and the model generates its response based on it.
Parts of a Clear Prompt
Clear prompts typically state the task, give relevant context, specify the desired format or length, and may include examples of good output.
Prompt Length
Every model has a limit on how much text it can process at once (its context window), measured in tokens. Counting words gives a rough sense of prompt length.
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Last updated: September 29, 2026. This definition is for general educational purposes only. It is not financial, investment, tax, legal, or medical advice, and it does not recommend any product or course of action. For decisions about your own situation, consult a qualified professional.