What is ECC memory, and what does it not protect against?

Error-correcting memory stores redundant information that allows supported hardware to detect and correct certain memory errors. The exact coverage depends on the implementation; a common scheme corrects single-bit errors and detects some multi-bit errors. ECC can improve reliability in suitable systems but requires compatible memory controllers, boards, and configuration. It does not replace backups or prevent application bugs, storage corruption, or every possible memory fault. Review logged corrected errors because repeated corrections can indicate a degrading component that needs attention.