What is the difference between loose coupling and tight coupling in the object oriented paradigm?

Question

Can any one describe the exact difference between loose coupling and tight coupling in Object oriented paradigm?

Answer 1

The way I understand it is, that tightly coupled architecture does not provide a lot of flexibility for change when compared to loosely coupled architecture.

But in case of loosely coupled architectures, message formats or operating platforms or revamping the business logic does not impact the other end. If the system is taken down for a revamp, of course the other end will not be able to access the service for a while but other than that, the unchanged end can resume message exchange as it was before the revamp.