Terminologies

1. Reference - Pointers to object stored on the heap.
2. Value - Direct access to the value represented by the variable.
3. De-reference - Also known as indirection. It gets the value from the address in the pointer variable.
4. Method sets - The set the compiler keeps inside. It says which methods are available for which type.
5. Zero Values - Default value of a variable when nothing is assigned to it.