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

In object oriented design, the amount of coupling refers to how much the design of one class depends on the design of another class. In other words, how often do changes in class A force related changes in class B? Tight coupling means the two classes often change together, loose coupling means they are mostly independent. In general, loose coupling is recommended because it's easier to test and maintain.

You may find this paper by Martin Fowler (PDF) helpful.