Data corruption is the unintended change of a file or the loss of information which usually occurs during reading or writing. The reason can be hardware or software malfunction, and because of this, a file could become partially or entirely corrupted, so it'll no longer work correctly since its bits shall be scrambled or lacking. An image file, for example, will no longer show an authentic image, but a random combination of colors, an archive will be impossible to unpack since its content will be unreadable, etcetera. In case this kind of an issue appears and it isn't noticed by the system or by an administrator, the data will be corrupted silently and if this happens on a drive which is part of a RAID array where the data is synced between various different drives, the corrupted file will be duplicated on all of the other drives and the harm will become long term. A large number of frequently used file systems either do not offer real-time checks or don't have high quality ones that can detect a problem before the damage is done, so silent data corruption is a common matter on internet hosting servers where huge amounts of data are kept.