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Dagger is a fully static, compile-time dependency injection framework. The library creates instances of objects that have a set of annotated dependencies. It generates code during compilation, which helps in validating these dependencies at compile time rather than run time. The library gains this validation through the use of annotations to indicate what needs to be injected and where it should be injected into the app's object graph. This process helps identify bugs early and ensures that objects are available when needed without manual intervention by the developer. Dagger supports both Java and Android development projects, enabling more maintainable, testable and scalable applications by implementing inversion of control patterns.

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