An OS, or operating system, is the program that manages all other application programs in a computer. Applications make requests to the OS through APIs, and users can interact with the OS through a command line or graphical user interface, often with a keyboard and mouse, or by touch.
You're probably familiar with OSs like macOS, iOS, Windows, and Linux. Operating systems are developed with different features to meet specific needs of the device it runs on.
For instance, a desktop OS like Windows works great on a large monitor, but would be cramped on a smartphone. Conversely, Android for smartphones would look awkward and sparse blown up on a large display.
Outside of personal devices, OSs are everywhere. Embedded operating systems are built into larger systems like cars, traffic lights, digital TVs, ATMs, airplane controls, digital cameras,
GPS navigation systems, and even elevators.
Network operating systems support devices connected to a local area network. And real-time operating systems guarantee a certain capability within a time constraint, like ensuring a certain object is available for a robot on an assembly line.
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