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Prompt

The input text sent to an AI model to elicit a specific response or behaviour.

Full Definition

A prompt is the complete text input a user or developer provides to a language model — encompassing the instruction, context, examples, persona, and any data the model should act on. Prompts can be a single sentence or many thousands of tokens. The quality of a prompt largely determines the quality of the output: a well-structured prompt that specifies the task, format, tone, and constraints will consistently outperform a vague one. Prompt engineering is the discipline of designing, testing, and optimising prompts to reliably elicit desired model behaviour across a range of inputs.

Examples

1

'Translate the following English text to French: Hello, how are you today?'

2

A multi-paragraph system prompt defining an AI assistant's persona, capabilities, and response style for a SaaS product.

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Related guides

What is Prompt Engineering?How to Use Role in AI PromptsHow to Add Context to AI PromptsDefining the Task in Your AI Prompt

Related Terms

System Prompt

The instruction layer sent before any user message that controls how an AI model

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Prompt Template

A reusable prompt structure with placeholders that are filled in at runtime.

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Instruction Prompting

Directly telling the model what to do using clear imperative commands.

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