The mathematical operation of ‘EXclusive OR’ logic gate on a number of data bits. For example the EXOR of two bits is 1, only if one of them is 1 and the other 0. The EXOR is widely used in data recovery (see RAID). If the EXOR of a number of blocks of data is stored, when one of those blocks is lost, its contents can be deduced by EXORing the undamaged blocks with the stored EXOR.

*See also: Error detection*