System prompts are the baseline instructions embedded before a conversation starts, determining things like tone, constraints, and how the AI prioritizes accuracy versus creativity. They operate in the background and shape every response you get, so understanding them matters when you're trying to predict or modify AI behavior.
A system prompt is a set of background instructions given to an AI before any user conversation begins, defining its tone, rules, constraints, and overall purpose for that interaction.
Understanding how system prompts work helps you configure AI tools to behave consistently, stay on topic, and follow specific guidelines without repeating instructions in every single message.
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