How does an operating system manage computer hardware and software?

An operating system (OS) acts as the essential manager of a computer’s resources, including the central processing unit (CPU), memory, file storage, and input/output devices.12

Resource Management and Protection

The OS functions like a series of concentric shells, where the hardware sits at the center and user programs occupy the outermost layers. This architecture provides two critical benefits:2
* Abstraction: It insulates outer layers from complex hardware details, allowing programs to request services without needing to manage low-level operations.2
* Protection: It prevents programs from interfering with one another or corrupting system data.12

To manage these resources, the OS employs several techniques:
* CPU Scheduling: It allocates limited time slices of the CPU to active processes, ensuring efficient multitasking.1
* Memory Management: It uses virtual memory to expand available address space and keep programs isolated.1
* I/O Coordination: It manages communication between programs and peripheral devices, preventing data conflicts.12

By handling these tasks, the operating system ensures that hardware is used efficiently and that multiple programs can run simultaneously without conflict.12