Angular Interview Practice

The @Injectable decorator in Angular is crucial for defining a class that can be used as a service. It signifies that the class can be injected as a dependency into other components or services through Angular's dependency injection system. By marking a class with @Injectable, you enable the Angular dependency injection framework to recognize it and manage its lifecycle, which includes creating instances of the service where needed.

This functionality is essential for creating services that can share data or functionality across different parts of an application while ensuring clean separation of concerns. When a class is decorated with @Injectable, it can leverage the powerful features of Angular’s DI system, allowing for efficient management and retrieval of shared instances.

The other options do not accurately reflect the purpose of the @Injectable decorator. Marking a class for routing, making a class a component, or signaling for input binding are related to other decorators in Angular, such as @Component and router-related functionality, but they do not relate to the core purpose of @Injectable.