Router-outlet is Angular’s directive that displays routed components in designated areas of your application, enabling dynamic content loading for single-page applications. With over 25 years of experience building enterprise applications and as the creator of CoreUI, I’ve used router-outlet extensively for complex navigation structures. The most effective approach is placing router-outlet strategically in layout components to define where routed content should appear. This provides clean separation between navigation structure and dynamic content while maintaining proper component hierarchy.