Primitive

A primitive value is of a scalar or built-in type and may completely fit into a single memory location.

Related concepts:  ValueTypeReference

Closest Wikipedia entry:  Primitive data type

Misconceptions about Primitive

3 documented Misconceptions

CallOnPrimitive

One can invoke a method on primitive values

PrimitiveIsObject

Primitive values are heap objects

PrimitiveTypeParameter

Type parameters of generic types can be assigned primitive types