What is event-driven architecture in AngularJS applications?

Event-driven architecture in AngularJS uses $emit, $broadcast, and $on for inter-component communication.

Instead of direct service coupling, AngularJS supports event-driven communication via $rootScope event system. Child scopes emit events upward, and parent scopes broadcast downward. In large systems, this enables decoupling but can create debugging complexity and hidden dependencies. Best practice is to use events only for cross-cutting concerns like notifications.