Passing data from parent to child components is fundamental for creating reusable Angular components and establishing proper data flow in component hierarchies. As the creator of CoreUI, a widely used open-source UI library, I’ve designed thousands of Angular components that rely on @Input properties for customization, configuration, and data sharing in enterprise applications. From my expertise, the most effective approach is to use the @Input() decorator with property binding. This method provides type-safe data flow, excellent component reusability, and clear parent-child communication patterns that scale well in large applications.