Objects:

An object is any entity, thing or organization that exits in real world.t consists of two fundamentals characteristics: its attributes and behaviors. For example: a dog is an object having attributes such as color, weight, age, etc. and behaviors such as barking, wagging tail, etc.

Class:

A class is the collection of similar objects. It is defined as the template or prototype to define the common attributes and behavior for all the objects of the class.

Inheritance:

Inheritance is the process by which objects of one class acquire the properties of objects of another class. It supports the concept of hierarchical classification.

Polymorphism:

Polymorphismrefers to the way of operating the same operator in different ways and different method or purpose. Operator overloading and the operation overloading are the examples of polymorphism. For example ‘+’ operator can be used for arithmetic operation and string concatenation both.