Software that is built into a computer and that is run when the computer is first turned on. 管理计算机上所有其他程序的计算机程序。
One of the most important pieces of systems software is the operating system,a set of programs that supervise the computer system's work. 系统软件最重要的功能之一是运行系统和一套程序，这些系统和程序管理计算机的系统工作。
