The Operating System is a base infrastructure software component of a computerized system. It controls all basic operations of the computer (or other electronic devices such as PDA, smartphone, etc.).

A system software component that is external to the operating system kernel. If the phrase is used to refer to the operating system itself, it is redundant because an operating system "is" software.

(1) For the Linux-based smart device operating system, see webOS. (2) An operating system that runs in a server on the Web. See Web server. Because all browsers perform "almost" the same no matter ...