what is functional requirements?

The desired operations of a programme or system are referred to as functional requirements in software development and systems engineering. Systems in systems engineering can be composed of both software-driven electronics and hardware that is electrical.

The functionality of a system or one of its subsystems is specified in a functional requirement document. The kind of programme, anticipated users, and system type where the software is used are further factors.Functional system requirements should also clearly describe the system services in detail. Functional user requirements may be high-level statements of what the system should be able to do.