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

When two objects are loosely coupled, they can interact but have very little knowledge of each other.

Loosely coupled designs allow us to build flexible OO systems that can handle change.

Observer design pattern is a good example for making classes loosely coupled, you can have a look on it in Wikipedia.