What is the difference between functional and non-functional requirements?

The distinction between functional and non-functional requirements lies in their definitions. Functional requirements articulate the specific actions a system must perform, effectively outlining its functionalities. In contrast, non-functional requirements detail how a system should exhibit its performance, covering elements such as usability, reliability, and performance standards. Both are essential for ensuring the system not only operates effectively but also meets user satisfaction levels.

Functional requirements focus on the system’s tasks, while non-functional requirements ensure that users have a positive experience.

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