what is non-functional requirement?

System qualities including security, reliability, performance, maintainability, scalability, and usability are defined by nonfunctional requirements (NFRs). They act as limitations or restrictions on how the system is designed for the various backlogs.

System qualities including security, reliability, performance, maintainability, scalability, and usability are defined by nonfunctional requirements (NFRs). They act as limitations or restrictions on how the system is designed for the various backlogs.

Non-functional requirements (NFRs) describe limitations that have an impact on how a system should perform as compared to functional requirements, which specify what a system is expected to do.Additionally, NFRs "align" the functional requirements. NFRs, for instance, provide features that make the product accessible, economical, and simple to use.