What is null in c#, java?

Question

Like... is it 0 like in C++? Or is it some \"special\" object? Or maybe something totally different?

-- EDIT --

I do know what it is, the

Answer 1

Since Java and C# run on virtual machines, it does not matter what is used physically to represent null, and it is not necessarily the same across implementations.

What matters is the behaviour of null, as defined in the language specification (see Dan's and MRFerocius' answers for details). Basically, it is a special value that variables of reference type can hold, and which cannot be dereferenced.

BTW, as a reference point, the Java serialization spec use a single byte value 0x70 to represent a null reference.