The basic Idea is that an object is a set of variables (defining its state, its scope is the object by default unless you modify it) and functions (defining its behavior). An object can contain more objects passing data among them.

Classes allow you to create objects with a defined set of variables and functions, that you can expand or ignore.

Basically u create an class with necessary functionality and create an object to access those functionality.

Object oriented principal are:

Abstraction

Inheritance

Polymorphisim

Encapsulation

As pavel suggests you go with the above link.

you will get more clear picture.

Thanks

OOP differs over non-OOP due to the following: Inheritance & Polymorphic which lead to run-time binding depending on the Run-time type.

 describe the features of object-oriented programming

please help me