What is polymorphism, what is it for, and how is it used?

Question

What is polymorphism, what is it for, and how is it used?

Answer 1

If anybody says CUT to these people

1. The Surgeon
2. The Hair Stylist
3. The Actor

What will happen?

• The Surgeon would begin to make an incision.
• The Hair Stylist would begin to cut someone's hair.
• The Actor would abruptly stop acting out of the current scene, awaiting directorial guidance.

So above representation shows What is polymorphism (same name, different behavior) in OOP.

If you are going for an interview and interviewer asks you tell/show a live example for polymorphism in the same room we are sitting at, say-

Answer - Door / Windows

Wondering How?

Through Door / Window - a person can come, air can come, light can come, rain can come, etc.

To understand it better and in a simple manner I used above example.. If you need reference for code follow above answers.