An operating system is a type of software which takes care of technical features of a computer's operation. It protects the user of the machine from the low-level details of the machine's operation and gives regularly needed facilities. There is no common definition of what an operating system comprises of. You can think of it as being the software which is previously sets up on a machine, before you insert something of your own. Usually the operating system has a variety of key elements: (i) a technical layer of software for directing the hardware of computer, such as the keyboard, disk drives, and the screen; (ii) a file system which gives a way of arranging files rationally, and (iii) a simple command language which allows users to run their personal programs and to control their files in a easy way. Some operating systems also give compilers, text editors, debuggers and a diversity of other tools. As the operating system (OS) is in charge of a computer, all requests to utilize its resources and devices require going through the Operating System. An OS thus gives (iv) legal entry points into its code for doing basic operations such as writing to devices.
Various Operating Systems Available are -
1. Single-User System
2. Batch System
3. Multi-Programmed System
4. Time Sharing System
5. Real Time System
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