Null

The value null is a reference that does not refer to anything.

Related concepts:  ValueReference

Closest Wikipedia entry:  Null pointer

Misconceptions about Null

7 documented Misconceptions

BoxedNull

Passing null to a wrapper class constructor creates an object representing the absence of a value

NullIsObject

null is an object

OutOfBoundsElementsAreNull

Out-of-bounds array elements are null

ThisCanBeNull

this can be null

ThisInConstructorIsNull

In a constructor, this is null