real time examples means the program used in real world applications
for example a simple project done for inventory control in a medical shop
inheritance-The properties of one class is derived by another class
the class which derives the property is called derived class.
The class from which the properties are derived are called Base class.
ex.The child who derives some behaviors from the parent
ex color,character from parent
polymorphisms-The ability to take more than one forms.
ex.The sum() function can be used to do the following
1.Adds two numbers when integers are passed as parameters
2.Concatenates two strings when strings are passed as parameters.