Operating System

An operating system (OS) is a collection of software that manages computer hardware resources and provides common services for computer programs. The operating system is a vital component of the system software in a computer system. Application programs usually require an operating system to function.

Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting for cost allocation of processor time, mass storage, printing, and other resources.

For hardware functions such as input and output and memory allocation, the operating system acts as an intermediary between programs and the computer hardware, although the application code is usually executed directly by the hardware and will frequently make a system call to an OS function or be interrupted by it. Operating systems can be found on almost any device that contains a computer—from cellular phones and video game consoles to supercomputers and web servers.

Examples of popular modern operating systems include Android, BSD, iOS, Linux, Mac OS X, Microsoft Windows, Windows Phone, and IBM z/OS. All these, except Windows and z/OS, share roots in UNIX.

Read more about Operating SystemTypes of Operating Systems, History, Components, Real-time Operating Systems, Operating System Development As A Hobby, Diversity of Operating Systems and Portability

Other articles related to "operating system, operating systems, system, systems":

Microsoft Power Toys
... provided by Microsoft for the Windows operating system ... into Windows since they are released after the public release of a Windows operating system ... not under technical support because they do not undergo the same rigorous testing that the operating system components do ...
Diversity of Operating Systems and Portability
... generally written for use on a specific operating system, and sometimes even for specific hardware ... This cost in supporting operating systems diversity can be avoided by instead writing applications against software platforms like Java or Qt ... These abstractions have already borne the cost of adaptation to specific operating systems and their system libraries ...
History Of Personal Computers - The IBM PC - IBM PC Clones
... read-only memory, most were purchased with disk drives and run with an operating system three operating systems were initially announced with the PC ... PC-DOS from IBM, and the third was the UCSD p-System (from the University of California at San Diego) ... PC-DOS was the IBM branded version of an operating system from Microsoft, previously best known for supplying BASIC language systems to computer hardware companies ...
... TSS-8 was a little time-sharing operating system co-written by Don Witcraft and John Everett at Digital Equipment Corporation in 1967 ... The operating system ran on the 12-bit PDP-8 computer and was released in 1968 ... John Everett wrote the disk handler, file system, TTY (teletypewriter) handler and 680-I service routine for TSS-8 ...
Personal Computer - Software - Operating System - Linux
... Main article Linux Linux is a family of Unix-like computer operating systems ... The system's utilities and libraries usually come from the GNU operating system, announced in 1983 by Richard Stallman ... It is used as an operating system for a wide variety of computer hardware, including desktop computers, netbooks, supercomputers, video game systems, such as the PlayStation 3 (until this option was ...

Famous quotes containing the words system and/or operating:

    It would be enough for me to have the system of a jury of twelve versus the system of one judge as a basis for preferring the U.S. to the Soviet Union.... I would prefer the country you can leave to the country you cannot.
    Joseph Brodsky (b. 1940)

    Many people operate under the assumption that since parenting is a natural adult function, we should instinctively know how to do it—and do it well. The truth is, effective parenting requires study and practice like any other skilled profession. Who would even consider turning an untrained surgeon loose in an operating room? Yet we “operate” on our children every day.
    Louise Hart (20th century)