Data corruption is the accidental modification of a file or the losing of information which often occurs during reading or writing. The reason could be hardware or software failure, and because of this, a file can become partially or completely corrupted, so it'll no longer work as it should because its bits will be scrambled or lost. An image file, for instance, will no longer show an actual image, but a random combination of colors, an archive will be impossible to unpack for the reason that its content will be unreadable, etc. In case such an issue appears and it is not recognized by the system or by an admin, the data will be corrupted silently and in case this happens on a disk drive that is part of a RAID array where the data is synced between various different drives, the corrupted file shall be copied on all other drives and the harm will be long term. Many widely used file systems either don't feature 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 very common issue on hosting servers where substantial amounts of info are kept.