The LSI 3ware 9750 RAID Controller is a hardware-based RAID (Redundant Array of Independent Disks) controller designed for enterprise storage solutions. It allows you to create and manage RAID arrays to improve performance, data redundancy, and reliability for hard drives or SSDs connected to the system. The 3ware 9750 series supports multiple RAID levels (RAID 0, 1, 5, 6, 10, and 50) and is typically used in servers or high-performance workstation environments.