What is the role of the @Provides annotation in the context of Dependency Injection and what is its purpose?

The @Provides annotation is used in Dependency Injection libraries (such as Dagger in Android) to denote methods that create and supply dependencies. These methods are usually located in modules (@Module) and are responsible for creating objects that will be injected into other parts of the application.

For example, if you have a class that depends on a certain service, you can write a method with @Provides that creates this service and allows the DI framework to automatically pass it where needed.

Example:

@Module
public class NetworkModule {
    @Provides
    Retrofit provideRetrofit() {
        return new Retrofit.Builder()
            .baseUrl("https://api.example.com")
            .build();
    }
}

Thus, @Provides explicitly indicates how to create dependencies that cannot be automatically created through constructors.