Why else is not indispensable when using if statements?

Answer 1

Else will run if everything is false in the if statement 'hierarchy'. (Meaning the if/ else if statements).
What if I don't want to run something if all those conditions are false?
That's why it's not mandatory.
Sometimes I may want to only do one operation under a certain condition, without doing a different operation if that condition is not met.

Example/

int x = -5;

// Make x positive
if(x < 0)
{
x = -x;
}

// That's all I wanted to check!

Answer 2

o thanks