Why output is 120

Question

int factorial(int n) {
if (n==1) {
return 1;
}
else {
return n * factorial(n-1);
}
}
int main() {
cout << factorial(5);
}

//Outputs 120

Answer 1

Why output is 120🤔

Answer 2

https://www.sololearn.com/learn/CPlusPlus/1641/?ref=app