• MS-DOS, or Microsoft Disk Operating System, is a command-line operating system for IBM compatible computers with x86 microprocessors.
• Windows is a Microsoft operating system that runs on common x86 Intel and AMD CPUs.
• The Linux OS is an open source operating system project that is based on UNIX and is a freely available, cross-platform operating system.
• Solaris, often known as SunOS, is a Unix-based operating system developed by Sun for their line of Scalable Processor Architecture-based CPUs (SPARC) as well as Intel-based processors.
• Until its discontinuation in 2014, Symbian OS was the world's most extensively used smartphone operating system based on ARM architecture. It was created by Symbiant Ltd, a collaboration between PDA and smartphone manufacturers such as Psion, Motorola, Ericsson, and Nokia.
• Android is a Linux-based operating system developed by Google that is primarily intended for touch-screen mobile devices such as smartphones and tablets.

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