CompTIA A+ 220-1201 (V15) Practice Question

ECC memory contains additional check bits and logic that allow the memory controller to detect and automatically correct a single-bit error within a word of data (SEC - single-error correction). It can also detect, but not correct, most double-bit errors. Parity memory can only detect single-bit errors, and non-ECC memory provides no error detection at all, so neither can correct the error once it occurs. This automatic single-bit correction is what makes ECC indispensable in systems where data integrity is paramount.