What is @Data used for?

@Data is a convenience annotation that bundles several others together: @Getter, @Setter, @ToString, @EqualsAndHashCode, and @RequiredArgsConstructor, all applied at once with a single annotation on the class.

@Data
public class Person {
    private final String id;
    private String name;
    private int age;
}
//  equivalent to individually applying @Getter, @Setter (on non-final fields),
//  @ToString, @EqualsAndHashCode, and @RequiredArgsConstructor

It's a fast way to create a typical mutable data class, but it's an all-or-nothing bundle — if you need to customize or exclude just one piece of that behavior (say, excluding a field from equals), you generally either add the individual exclusion annotations alongside @Data, or drop down to the individual annotations instead of the bundle.

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