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What is System Prompt?
Hidden ground rules that steer how an AI behaves before you chat.
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Simple Definition
A system prompt is developer- or product-set instructions that define the model's role, tone, tools, and safety rules, usually applied before the user message.
Explanation level
Tap a persona to hear the same idea in a totally different voice.
Try “Like I'm 5™” for a picture-book version - not the grown-up wording above.
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