Почему в одних случаях пишут void main(), а в других случаях int main() {return 1;}

а объяснить не может почему

Но вес же пишут и void main(){}

An implementation shall not predefine the main function. This function shall not be overloaded. It shall
have a return type of type int, but otherwise its type is implementation-defined. All implementations shall
allow both of the following definitions of main:
int main() { /* ... */ }
and
int main(int argc, char* argv[]) { /* ... */ }
In the latter form argc shall be the number of arguments passed to the program from the environment
in which the program is run. If argc is nonzero these arguments shall be supplied in argv[0]
through argv[argc-1] as pointers to the initial characters of null-terminated multibyte strings (ntmbs
s) (17.5.2.1.4.2) and argv[0] shall be the pointer to the initial character of a ntmbs that represents the
name used to invoke the program or "". The value of argc shall be non-negative. The value of argv[argc]
shall be 0. [ Note: It is recommended that any further (optional) parameters be added after argv. — end
note ]

Но вес же пишут и void main(){}, вот не пойму для чего тогда это надо?