The Intel(R) Serial IO I2C Host Controller - 9D65 is a part of the Intel Serial I/O (SIO) technology, which is a collection of features designed to allow Intel chipsets to handle a variety of communication protocols, such as I2C (Inter-Integrated Circuit), SPI (Serial Peripheral Interface), and UART (Universal Asynchronous Receiver-Transmitter), used for connecting various peripheral devices like sensors, touchscreens, and other low-speed devices.

The I2C Host Controller (specifically the Intel(R) Serial IO I2C Host Controller - 9D65) is responsible for managing communication between the system's I2C devices (such as onboard sensors, or embedded controllers) and the CPU or chipset. It helps to transfer data between these devices and the operating system.