Difference between or and xor

It has to do with mutual exclusion. xor is exclusive. or is inclusive.

Truth Table Comparison

$x $y ($x or $y) ($x xor $y)
0  0    0          0
1  0    1          1
0  1    1          1
1  1    1          0

Note: the difference in the last case. xor is only true when either $x or $y is true, but not both (as the case for or).

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