The GIGABYTE GBB36X Controller is a hardware component used primarily in GIGABYTE motherboards that support NVMe (Non-Volatile Memory Express) devices, such as M.2 SSDs (Solid State Drives) or other storage devices that require direct communication with the motherboard's PCIe lanes. This controller is generally responsible for handling and managing the communication between your system and these NVMe devices.

The GBB36X driver is a software package that enables the operating system (Windows) to properly interact with the hardware controller, ensuring that your NVMe storage devices are recognized and function optimally.