Use of input()

Question

I'm just slightly at a loss of when I would use this since it seem that all it does is be a variable usable 1 time.

Answer 1

It is used to receive user input.
Example ,you and a calculator, You can receive one or more inputs,and then can add those and display the answer.

Answer 2

To use multiple inputs you just make more (example)
Z =(input(""))
X =(input(""))
Y =(input(""))