ECC is Error Correction Code or Error Correting Code.
Basically it is a way to make sure that the data remains free from one bit errors. One bit errors are the most common. ECC cannot fix more that a one bit error but anything more than a one bit are extremely rare.
Your CPU uses ECC in its cache.
This is a basic explination. If you need more info or something more specific just let us here in the THGC know.
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