Reference types contain addresses of dynamic blocks of memory that are stored on the Heap
This memory block changes size depending on the applications requirements.
All classes are reference types.
A reference is a variable that refers to the location on the heap
The reference acts like an alias for the object.
String - is based on a class
Object - is based on a class
Becauase this can hold anything it is always late-bound
Array - is based on a class
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