Q. Explain about non-functional requirement for a software ?
Ans) Nonfunctional requirements are the basic characteristics of the system which will not be expressed as functions - such as portability of the system, maintainability of the system, usability of the system, etc.
Nonfunctional requirements can include:
# performance issues,
# reliability issues,
# interface with other external systems,
# human - computer interface issues,
# security and maintainability of the system, etc.