Using the @Output decorator is essential for child-to-parent communication in Angular applications, enabling components to emit custom events and maintain loose coupling. As the creator of CoreUI, a widely used open-source UI library, I’ve designed thousands of Angular components using @Output decorators for button clicks, form submissions, and custom interactions in enterprise component libraries. From my expertise, the most effective approach is to use @Output decorator with EventEmitter and descriptive event names. This method provides type-safe event communication, clear component interfaces, and excellent developer experience while maintaining component reusability and testability.