The Intel(R) ESB2 SATA RAID Controller is a hardware component that controls the connection between your computer's SATA hard drives and the RAID array (Redundant Array of Independent Disks) if you're using multiple disks in a RAID configuration. This controller is part of the Intel ESB2 (Embedded Server Board) chipset, which is commonly used in server or workstation systems to manage storage, especially when combining multiple drives into a RAID array for performance or redundancy benefits.

To use this controller with your system, you need to install the driver to allow your operating system to communicate with the controller. Without the proper driver, the system will not be able to detect or properly manage the drives connected to the RAID controller.