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Primitive and Reference Values

A variable can hold one of two types of values: primitive values and reference values. Primitive values are data that are stored on the stack. Primitive value is stored directly in the location that the variable accesses. Reference values are objects that are stored in the heap. Reference value stored in the variable location is a pointer to a location in memory where the object is stored. Primitive types inlcude Undefined, Null, Boolean, Number, or String.