The Intel(R) Serial IO I2C Host Controller - 5AB8 is a driver used for managing communication between your computer's motherboard and various I2C devices, such as sensors, displays, or other peripherals. The "I2C" in its name stands for "Inter-Integrated Circuit," which is a communication protocol used to transfer data between different components within a computer or other devices. In essence, this driver allows the operating system to communicate with the I2C devices through the Intel Serial IO Controller.