# Developer Guide: Angular Services

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Services are a feature that angular brings to client-side web apps from the server side, where services have been commonly used for a long time. Services in angular apps are substitutable objects that are wired together using dependency injection (DI). Services are most often used with dependency injection, also a key feature of angular apps.

### Related Topics

- Understanding Angular Services
- Creating Angular Services
- Registering Angular Services
- Managing Service Dependencies
- Injecting Services Into Conrollers
- Testing Angular Services

### Related API

- `Angular Service API`