What is the difference between @Provides and @Binds annotations in the context of Dependency Injection?

In the context of Dependency Injection (DI) in Android (for example, with Dagger or Hilt), the annotations @Provides and @Binds are used to specify how dependencies are created, but they differ in method and application:

• @Provides is applied to methods that create and return an object. These methods can contain arbitrary code to instantiate the object.

  @Provides
  MyInterface provideMyInterface() {
      return new MyImplementation();
  }
  

• @Binds is used to bind an interface to a specific implementation, but requires that the implementation is already provided elsewhere (for example, via a constructor with @Inject). The method with @Binds must be abstract and simply return the interface.

  @Binds
  abstract MyInterface bindMyInterface(MyImplementation impl);
  

Key differences:

• @Provides allows writing logic to create the object.
• @Binds simply binds the interface to an implementation without additional code.

Using @Binds is more efficient and preferred when the implementation is already available via a constructor, as it generates more optimized code.