Description: Dependency Injection (DI) is a fundamental design pattern in software development, especially in the context of modern web applications. This pattern is used to implement Inversion of Control (IoC), allowing a class to receive its dependencies from external sources rather than creating them internally. This promotes cleaner, more modular, and maintainable code, as classes are not tightly coupled to specific implementations. In Angular, DI is managed through an injection container that is responsible for instantiating and providing the necessary dependencies to components and services. This approach not only facilitates code reuse but also enhances testability, as dependencies can be easily replaced with mock versions during unit testing. DI in Angular is based on decorators and metadata, allowing developers to declaratively define what dependencies each class needs. In summary, Dependency Injection is a key pillar in modern software architecture, promoting separation of concerns and scalability of applications.
