What is the importance of @Override annotation in Java?

public @interface Override

class BaseClass {
   public void display() {
      System.out.println("In the base class,test() method");
   }
}
class ChildClass extends BaseClass {
<strong>   </strong>@Override <strong>
</strong>   public void display() {
      System.out.println("In the child class, test() method");
   }
}
// main class<strong>
</strong>public class OverrideAnnotationTest {
   public static void main(String args[]) {
      System.out.println("@Override Example");
      BaseClass test = new ChildClass();
      test.display();
   }
}

@Override Example
In the child class, test() method