How does an operating system communicate with hardware?

• A. Directly through cloud services
• B. By using system BIOS calls
• C. Through device drivers
• D. Via cloud-based hardware managers

Answer: (C)

Device drivers are the bridge between the operating system and hardware. The OS uses generic I/O interfaces, and each device type has a driver that translates those generic requests into the specific commands and formats the hardware expects. The driver also manages interrupts, direct memory access, buffering, and timing details, so the OS doesn’t need to know the device’s inner quirks. This separation lets a single OS support many devices by loading the appropriate drivers, keeping hardware-specific logic contained in the drivers themselves. Cloud services or cloud-based hardware managers live outside the machine and aren’t how the OS talks to local hardware, and BIOS calls are historical/bootstrap mechanisms, not the normal channel for ongoing device communication.