OS

The essential software layer managing hardware resources and providing common services for application execution.

An operating system (OS) acts as the primary intermediary between computer hardware and the user. It governs critical subsystems: CPU scheduling, memory allocation, and peripheral I/O. Modern implementations like Windows 11, macOS Sonoma, and Linux distributions (e.g., Ubuntu 22.04) ensure multiple applications share resources without conflict. By handling low-level tasks like file system management and driver communication, the OS provides a stable environment for all high-level software operations.

https://en.wikipedia.org/wiki/Operating_system