What is @Setter used for?

@Setter generates a standard setter method for a field, following the JavaBeans convention of setFieldName(Type value), and like @Getter, it can be applied per-field or at the class level to cover every field at once.

public class Person {
    @Setter
    private String name;
}
//  generates:
//  public void setName(String name) { this.name = name; }

A common pattern is applying @Getter at the class level but adding @Setter only to specific fields that should actually be mutable, keeping other fields effectively read-only from outside the class — useful for fields that should be set once (often via a constructor) and never changed afterward.

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