Annotation Tutorial for Dummies in Kotlin

Annotation always works like a magic to me. Just add @ to some keyword, and magic happens! Where is the actual work done? Is it some black magic?

We see @Override and think perhaps we could get to see the source by command+click into it. Below is what we see…

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.SOURCE)
public @interface Override {
}