How exactly does dependency injection reduce coupling?

Question

I\'ve done plenty of reading on Dependency Injection, but I have no idea, how does it actually reduce coupling?

The analogy I have of DI is that all components are r

Answer 1

In DI one component calls another component only via a well-defined interface and all components "glue" together via configuration and not code.
As a result we can swap implementations used by an application by re-configuration alone.
As an example in containers you can visualize dependency-injection as a reversed look-up (if you have used JNDI). Instead of having resource/module names hard-coded, you declare what is needed for a class (acting as a bean).The container is responsible for providing everything at run time.
This term was coined by Martin Fowler and you can check his article on the concept DI