What is Functional Requirement and Non Functional Requirement

What is Functional Requirement and Non Functional Requirement
Functional Requirement :
Functional requirements describe the functionality of the product. They describe
exactly what tasks the software must perform. Functional requirements define the
scope of the system, the product boundaries, and its connections to adjacent
systems. Functional requirements also define the business rules. Business rules are
the rules that the system must conform to, based on the individual business. This
includes defining the data that must be tracked. The business rules are the most
important type of functional requirements and most of your requirements will be of
this type.
ISO : ISO (International Standards Association)
JAD : JAD (Joint Application Development)

Non-Functional Requirement :
Non-Functional requirements describe the look and feel of the system. This includes the visual properties of the system, its usability, and the performance requirements – how big, how fast, etc. Non-Functional requirements also include the product’s intended operating environment and any maintainability, portability and security issues. Non-Functional requirements also include cultural and political issues as well as legal requirements that the software must conform to.
OOA : OOA (object oriented analysis)
OOD :
OOD (object oriented design)
OOP :
OOP (object oriented programming)