Needing Postfix Explanation

Question

I don't understand the concept of postfix.

Answer 1

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Answer 2

For example the increment postfix for int i: i++
When you call i++ it returns the old value of i and increases i after that.
int i = 3;
int x = i++; //x =3
int y = i; //x= 4

Answer 3

What is this typically used for?