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 and indirection. The process of accessing the value from the address stored in the pointer variable.
4. Method sets - This the set internally maintained by the compiler. It defines which methods are available for which type.
5. Zero Values - Default value of a variable when nothing is assigned to it.