What is a functional requirement versus a non-functional requirement?

< 1 min read

Functional requirements define what a system should do, like features or tasks.
For example, “The system should generate weekly sales reports.”
Non-functional requirements define how the system performs, like speed or security.
An example is “Reports must load within 5 seconds.”
In my project, we documented both to guide developers and testers.
Functional ensures the system works correctly; non-functional ensures it works well.
Both are critical for meeting business expectations.

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