Wikipedia
Error-correcting code memory (ECC memory) is a type of computer data storage that can detect and correct the most-common kinds of internal data corruption ECC memory is used in most computers where data corruption cannot be tolerated under any circumstances, such as for scientific or financial computing Typically, ECC memory maintains a memory system immune to single-bit errors: the data that is read from each word is always the same as the data that had been written to it, even if one of the bits actually stored has been flipped to the wrong state Most non-ECC memory cannot detect errors, although some non-ECC memory with parity support allows detection but not correction
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