What are the contents of FRS? | Manual Testing

F : Function Behaviours
R : Requirements (Outputs) of the System that is defined.
S : Specification (How, What, When, Where, and Way it behavior’s.)
FRS :: Function Requirement Specification.
This is a Document which contains the Functional behavior
of the system or a feature. This document is also known as EBS External Behaviour Specification - Document. Or EFS External Function Specification.