how can we use abstraction and polymorphism in project

Mr.Amit & Mr. Rajeesh, I am very greatful to your answer. Can you please share a single phase of your project where you have implemented abstraction and polymorphism. The things is i am looking for a change and technical leads asked me question "Have you ever implemented abstraction and polymorphism in your project ?" and in actual i never used them.

So i just need that kind of stuff.
Thank you in advance :)