**Functions - Definition, Types, Domain Range and Video Lesson**
https://byjus.com/jee/functions-and-its-types/

Also in a function, there can’t be two pairs with the same first element. A Condition for a Function: Set A and Set B should be non-empty. In a function, a particular input is given to get a particular output. So, A function f: A->B denotes that f is a function from A to B, where A is a domain and B is a co-domain.

**DA:** 42 **PA:** 25 **MOZ Rank:** 26