The operating system (OS) of a computer, or of a tablet or phone, for that matter, is the basic software that transforms the machine from an collection of electronic components into a usable device. Currently, Windows, Mac OS, Linux, iOS, and Android are the most familiar operating systems. Most operating system software is written by a handful of companies, except for Linux, which is written by volunteers, although even there, various companies oversee much of the development.
Operating systems have undergone great changes over the last 30 years. In the early 1980s, PC operating systems were fundamentally designed for only one user. The concept of security was mostly ignored, and no version of Disk Operating ...
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