recursion and where it can be used code example

Example 1: recursion

# modified code tranclated to python from (Drab Duck)

def fact(num):
  if num <= 1:
      return 1
  else:
    return num*fact(num-1)

Example 2: recursion

/*Java*/
static void recursion(){ recursion(0); }
static void recursion(int x){
	System.out.println("eheh " + x);
    if(x != 666) recursion(x+1);
}