What is the meaning of XOR in x86 assembly?

Question

I\'m getting into assembly and I keep running into xor, for example:

xor     ax, ax

Does it just clear the register\'s value?

Answer 1

It determines the logical eXclusive OR

0 XOR 0 = 0
0 XOR 1 = 1
1 XOR 0 = 1
1 XOR 1 = 0

So, TRUE only if one of the expressions is true, not both.