Encapsulation is one of the major properties of OOP. How is it implemented in software terms?

Encapsulation is a way to implement data hiding and abstraction by wrapping up data and associated functions into single unit called object.

                               An object binds together data and its associated functions under one unit thereby enforcing encapsulation as encapsulation means wrapping up data and associated functions together into a single unit.

What is polymorphism?

It is the ability of representing a thing in more than one form. Polymorphism is used in constructor overloading.