Functional and Non- Functional requirement.

 Basically, functional requirements describe the features, functioning, and
usage of a product/system/software from the perspective of the product and
its user.

 Although referred to as "requirements," they really are a form of design, albeit
high-level.

 Functional requirements also often are called "functional specifications," and
"specification" is a synonym for design.

 Non-functional requirements are not non-functional at all.

 Rather, they describe various quality factors, or attributes, which affect the
functionality's effectiveness.

 They do not exist in the abstract but only with respect to relevant functionality.

 They are often called "ilities," because many end in "ility," such as, usability,
reliability, and maintainability

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