Answer 1

When you have nothing to return, then use Void but if you want to return something then use int,string etc instead of Void.

for example

int a,b,c;
void myFunction(){
c = a+b; //So Now here You can't use return type
}

int myFunction(){
c = a+b; //So Now here You can use return type
return c;
}

Hope you got the idea