What is a service in Angular? Why are services needed in Angular?

A service in Angular is a class with business logic that is not tied to the view and can be used across different components.

Why they are needed:

• To move repetitive code out of components (requests, calculations, data processing).
• To organize shared data, for example storing state, a cache, or the current user.
• To communicate with the server (HTTP requests, an API).
• To separate responsibilities: the component handles the UI, the service handles the logic.

Services are registered in the DI system, and Angular creates and injects instances wherever they are needed.