Immutable Objects

Immutable means "can not change". When an object is referred to as Immutable it means the internals cannot be changed i.e. it's member variables.

This is a design choice, where you might wish objects to be passed around as method arguments but you do not want the original object's internal values to change.
Remember that in C# when you pass an object of type Reference Type into a method as an argument, you are actually passing it by reference, meaning the method can change the original objects values.
To protect objects from this make them immutable.

How:
Objects are made immutable by simply making their internal variable readonly.

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