I am trying understand OOP or Object oriented programming.
If someone could put a definition that makes sense and how it could be used as a real-world example.

http://en.wikipedia.org/wiki/Object-oriented_programming

well object oriented programming is an advanced form of procedural oriented programmin....the basic characteristic of this oop is that it supports inheritance n polymorphisms....in this programming the data are given more priority than the functions....creating class ...the data can be keep as private or public...where it is necessary for any class to have a public statements...
moreover it explains attribute and behavior of any program...this is why it is connected as real world ......

The Wikipedia article is pretty good at explaining OOP.

Obviously, not all OOP languages look the same. After all, a C++ scope operator would look pretty strange in Java! :P