WHY RECURSION,HOW RECURSION WORKS?

Question

I didn't understand recursion!
How much fast recursion is?

Answer 1

RECURSION IS MOSTLY A MORE READABLE, BUT LESS EFFICIENT WAY IF LOOPING. IT IS USEFUL IF YOU WANT TO REMEMBER THE HISTORY OF THE FUNCTION

Answer 2

It's a function that generally, if it doesn't mean certain condition (exit condition) it will return a calling to the same function, so it'll loop until it reaches a condition where it doesn't return a calling to the same function