The driver is for the Promise FastTrak 133 Lite RAID controller, which is a type of hardware used in computers to manage storage devices such as hard drives in a RAID (Redundant Array of Independent Disks) configuration. The "WinNT" part refers to the driver being designed for Windows NT and other versions of Windows, like Windows XP, 7, and newer systems.
This RAID controller is typically used to provide faster disk access and redundancy features like RAID 0, RAID 1, RAID 0+1, or RAID 5 (depending on the controller version), which can improve data speed, reliability, and performance. The MBFastTrak133 Lite model specifically supports the 133 MHz Ultra ATA/100 standard for managing IDE drives.