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en.wikipedia.org/wiki/List_of_operating_systems

This is a list of operating systems.Computer operating systems can be categorized by technology, ownership, licensing, working state, usage, and by many other characteristics. In practice, many of these groupings may overlap. Criteria for inclusion is notability, as shown either through an existing Wikipedia article or citation to a reliable source.

www.howtogeek.com/190217/10-alternative-pc-operating-systems-you-can-install

Linux isn’t the only alternative PC operating system out there. Some alternative operating systems are developed by large corporations, while others are small projects worked on by hobbyists. We don’t recommend you install most of these on your actual PC.

www.computerhope.com/os.htm

An operating system or OS is software installed on a computer's the hard drive that enables computer hardware to communicate with and run computer programs. Without an operating system, a computer and software would be useless. The picture to the right is an example of Microsoft Windows XP, a popular operating system.

edu.gcfglobal.org/en/computerbasics/understanding-operating-systems/1

Operating systems usually come pre-loaded on any computer you buy. Most people use the operating system that comes with their computer, but it's possible to upgrade or even change operating systems. The three most common operating systems for personal computers are Microsoft Windows, macOS, and Linux.

www.lifewire.com/operating-systems-2625912

Laptops, tablets, and desktop computers all run operating systems that you've probably heard of. Some examples include versions of Microsoft Windows (like Windows 10, Windows 8, Windows 7, Windows Vista, and Windows XP), Apple's macOS (formerly OS X), Chrome OS, BlackBerry Tablet OS, and flavors of the open source operating system Linux.

smallbusiness.chron.com/five-common-operating-systems-28217.html

Five common operating systems are Microsoft Windows, Google's Android, Apple's iOS, Linux and Apple's macOS. Each has a different set of typical uses and types of devices on which it can be installed.

support.microsoft.com/en-us/help/13443

Find operating system info in Windows 8.1 or Windows RT 8.1. To find out which version of Windows your device is running, press the Windows logo key + R, type winver in the Open box, ... button, type Computer in the search box, right-click on Computer, and then select Properties.

www.wordplays.com/crossword-solver/computer-operating-system

Answers for computer operating system crossword clue. Search for crossword clues found in the Daily Celebrity, NY Times, Daily Mirror, Telegraph and major publications. Find clues for computer operating system or most any crossword answer or clues for crossword answers.

www.thetoptens.com/best-operating-systems

Fun withgets will light your way into a a very interesting society, where you control everything. I would recommend this operating system in a heartbeat! Android is definitely the best operating system because it is an upcoming fairly new OS that is very simple and is very safe in the way of virus protection and speed.

en.wikipedia.org/wiki/Operating_system

An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer programs.. Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, printing, and other resources.. For hardware functions such as input and ...