Answer / kishore anumala

Well lets think we have went to a car showroom to purchse a
car the vendor expalins the details of car.

First he explains the minimum details of car like
Its cost, Speed, Milage, etc..
Here we make use of Interface(Just implementing the
existing members).

And if you are interested in purchasing car
The vendor gives you lot more details of the car like
Model Name, Chassis model, Type of finishing etc...
Here we make use of Abstract class(Overriding the existing
class members for presenting more information)

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