Dependancy injection in details

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Accepted Answer

Dependency injection is a design pattern used to remove hard-coded dependencies and make code more flexible and testable.

It allows objects to be created with their dependencies supplied from outside.
It promotes loose coupling between objects.
It can be implemented using constructor injection, setter injection, or interface injection.
It simplifies unit testing by allowing dependencies to be easily mocked or stubbed.
It improves code maintainability and scalability.
Example: A class that needs a database connection can have the connection injected instead of creating it internally.
Example: A class that needs to send emails can have an email service injected instead of creating it internally.

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