The FAT file system is a legacy file system that is both simple and robust. It works well even in lightweight uses. But it cannot deliver the same speed, reliability and scalability as some modern file systems. It is, however, supported for compatibility reasons by nearly all currently developed operating systems for personal computers. It is also supported by many mobile devices and embedded systems. That makes it a well suited format for data exchange between computers and devices of almost any type and age from 1981 up to the present.