Doubts with the prefix of the selector in Angular

The prefix of the selectors in Angular by default is 'app'. Most of the examples and tutorials I have seen do not follow the prefix rule. It is not a major problem because although the prefix is not used the application works, although I understand that it is not a good practice.

My doubt arises at the moment I create modules. Can I use a different prefix? I understand that the idea of making a module is to encapsulate a functionality, so it seems logical to me that it has a different prefix.

Edited so that it shows a code with what I refer to the selector prefix.

@Component({
   selector: 'app-animals',
   templateUrl: './animals.component.html',
   ...
})