Question

What is sets and function ?

Answer 1

A set is a collection or group of objects or elements.
A function relates an input to an output.

Answer 2

A set is a group or collection of objects or numbers, considered as an entity unto itself. Sets are usually symbolized by uppercase, italicized, boldface letters such as A, B, S, or Z. Each object or number in aset is called a member or element of the set.