Why do we need the require property in the directive?

Question

Angular

Hello. I can't figure out what the require property is used for and what its use is. As I understand it, it requests a specific angular object and inserts it into the 4th argument of the link function. Did I understand correctly? And if so, can you explain what is the benefit of this and in what situations is it better to use this property? I understand that everything is in the documentation, but I would like to ask people practicing angular. Thanks in advance.

Answer 1

1) custom validators - use require ngModel
2) nested directives
3) ...

Answer 2

Requests not an object, but a controller instance of a directive at the same level of the hierarchy or higher in the DOM. Moreover, it can request not one controller, but several.
Used to organize interaction between directives.