What is the difference between Functional & non-functional requirements

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Accepted Answer

Functional requirements describe what the system should do, while non-functional requirements describe how the system should perform.

Functional requirements focus on specific functions or features that the system must provide.
Non-functional requirements focus on qualities or constraints that the system must meet, such as performance, security, or usability.
Functional requirements are typically documented in use cases or user stories.
Non-functional requirements are often documented in a separate section, detailing performance metrics, security protocols, and other constraints.
Example of functional requirement: The system must allow users to create an account.
Example of non-functional requirement: The system must be able to handle 1000 concurrent users without crashing.

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