Some operating systems were developed in the 1950s, when computers could only execute one program at a time. Later in the decade, computers included many software programs, sometimes called libraries, which were linked together to create the beginning of today's operating systems.
The OS consists of many components and features. Which features are defined as part of the OS vary with each OS. However, the three most easily defined components are:
- Kernel: This provides basic-level control over all of the computer hardware devices. Main roles include reading data from memory and writing data to memory, processing execution orders, determining how data is received and sent by devices such as the monitor, keyboard and mouse, and determining how to interpret data received from networks.
- User Interface: This component allows interaction with the user, which may occur through graphical icons and a desktop or through a command line.
- Application Programming Interfaces: This component allows application developers to write modular code.
Examples for OSs include Android, iOS, Mac OS X, Microsoft Windows and Linux.
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