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An operating system (OS) is the low-level software which handles the interface to peripheral hardware, schedules tasks, allocates storage, and presents a default interface to the user when no application program is running.

Description

The OS may be split into a kernel which is always present and various system programs which use facilities provided by the kernel to perform higher-level house-keeping tasks, often acting as servers in a client-server relationship.

Some may include a graphical user interface and window system as part of the OS, while others may rely on a command-line interface. The operating system loader, BIOS, or other firmware required at boot time or when installing the operating system would generally not be considered part of the operating system, though this distinction is unclear in the case of a ROM-based operating system such as RISC OS.

The facilities an operating system provides and its general design philosophy exert an extremely strong influence on programming style and on the technical cultures that grow up around the machines on which it runs.

Operating system examples

Operating systems from Apple

References

External links

FOLDOC logo.png This page uses GFDL licensed content from the Free On-line Dictionary of Computing.
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