Inversion of control (IOC) and Dependency injection (DI)

In this section we will discuss about how IOC and DI can help us build loosely coupled software architecture. I am not sure should we call this a design pattern or more of a approach. If you search around the web you will see lot of controversy on whether IOC is a design pattern or not. From my point of view it is a design pattern as it solves a problem context.