Dagger is an open-source dependency injection framework designed to make it easier for developers to write efficient, maintainable code. By allowing developers to simply specify objects and their dependencies, Dagger eliminates the need to manually configure object relationships. This makes Dagger particularly useful for writing complex applications as it reduces the amount of time needed to build and maintain them. Additionally, Dagger is built with scalability in mind, so it can easily handle applications of any size. Dagger is designed to be intuitive and easy to use, making it a great choice for developers looking to quickly and easily write robust applications.