What is polymorphism, what is it for, and how is it used?
I believe it is incorrect to imply that polymorphism is specific to classes and/or object-oriented programming, seeing how ad hoc polymorphism or parametric polymorphism do not necessarily require classes and/or objects. I think what this answer is talking about is subtyping (also known as subtype polymorphism or inclusion polymorphism).

oop - What is the difference between dynamic and static polymorphism in ...
Can anyone provide a simple example that explains the difference between Dynamic and Static polymorphism in Java?

oop - What is polymorphism in JavaScript? - Stack Overflow
Polymorphism is one of the tenets of Object Oriented Programming (OOP). It is the practice of designing objects to share behaviors and to be able to override shared behaviors with specific ones. Polymorphism takes advantage of inheritance in order to make this happen. In OOP everything is considered to be modeled as an object. This abstraction can be taken all the way down to nuts and bolts ...

Polymorphism vs Overriding vs Overloading - Stack Overflow
In other words, type polymorphism vs. ad-hoc polymorphism. I'm upvoting this answer, even if not as complete as it should, because it correctly states that both overloading and overriding are related to polymorphism.

What is the main difference between Inheritance and Polymorphism?
18 The main difference is polymorphism is a specific result of inheritance. Polymorphism is where the method to be invoked is determined at runtime based on the type of the object. This is a situation that results when you have one class inheriting from another and overriding a particular method.

Polymorphism - Define In Just Two Sentences - Stack Overflow
Polymorphism is the idea of having mutiple implementation of same abstract concept. It can be static polymorphism as in method overloading and operator overloading or it can be dynamic polymorphism as in method overriding or design pattarsn like strategy pattern.

oop - Polymorphism (in C) - Stack Overflow
Possible Duplicate: How can I simulate OO-style polymorphism in C? I'm trying to better understand the idea of polymorphism with examples from languages I know; is there polymorphism in C?

Why do we need virtual functions in C++? - Stack Overflow
23 I've my answer in form of a conversation to be a better read: Why do we need virtual functions? Because of Polymorphism. What is Polymorphism? The fact that a base pointer can also point to derived type objects. How does this definition of Polymorphism lead into the need for virtual functions? Well, through early binding. What is early binding?

java - Why to use Polymorphism? - Stack Overflow
Polymorphism (both runtime and compile time) is necessary in Java for quite a few reasons. Method overriding is a run time polymorphism and overloading is compile time polymorphism.

Deserialize polymorphic json object with newtonsoft
Nope, not gonna work. The Newtonsoft.JSON package has options to include type names when you serialize an object, so deserializing works correctly with polymorphism. But with your plain JSON, the deserializer has no way of knowing which class to instantiate inside your array.