@Target specifies the possible kinds of elements which can be annotated with the annotation (such as classes, functions, properties, and expressions);
@Retention specifies whether the annotation is stored in the compiled class files and whether it’s visible through reflection at runtime (by default, both are true);
@Repeatable allows using the same annotation on a single element multiple times;
@MustBeDocumented specifies that the annotation is part of the public API and should be included in the class or method signature shown in the generated API documentation.