What is dependency injection?

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Accepted Answer

Dependency injection is a design pattern that allows objects to be injected with their dependencies rather than creating them internally.

Dependency injection helps to decouple the code and improve testability and maintainability.
It promotes loose coupling by allowing objects to depend on abstractions instead of concrete implementations.
There are three common types of dependency injection: constructor injection, setter injection, and interface injection.
Example: Instead of creating a database connection internally, a class can be injected with a database connection object.