What's the difference between requires and requires static in module declaration

Question

What\'s the difference between requires and requires static module statements in module declaration?

For example:

Answer 1

The primary difference between the two is that in case of

requires static foo.module;

The dependence is mandatory in the static phase, during compilation, but is optional in the dynamic phase, during execution while on the other hand

requires bar.module;

Is added to declare that the module depends, by name, upon some other modules, at both compile time and run time.