A RAID Controller Windows driver is a software package that enables communication between your computer's operating system and a RAID (Redundant Array of Independent Disks) controller. A RAID controller is responsible for managing multiple hard drives or SSDs in a RAID configuration (e.g., RAID 0, RAID 1, RAID 5, etc.), providing data redundancy, improved performance, or both, depending on the RAID level.
The RAID controller driver allows your Windows OS to recognize and interact with the controller card, making the RAID array's disks appear as individual drives or as a single logical volume, depending on the RAID setup.