Describe instantiation and how it relates to 'is-a relationships.'

What will be an ideal response?

Everything is an object, and every object is a member of a more general class. Your desk is a member of the class that includes all desks, and your pet fish is a member of the class that contains all fish. These statements represent is-a relationships-that is, relationships in which the object "is a" concrete example of the class. The difference between a class and an object parallels the difference between abstract and concrete. An object is an instantiation of a class, or one tangible example of a class.