关机，即正常断开电脑电力。关机后，CPU、RAM部件和硬盘等都会失去电力；而一些内部零件仍会维持电源供应，如时钟。

Windows

在Microsoft Windows（PC或服务器）通常选择桌面开始菜单的关机键关机。

To shut down or power off a computer is to remove power from a computer's main components in a controlled way. After a computer is shut down, main components such as CPUs, RAM modules and hard disk drives are powered down, although some internal components, such as an internal clock, may retain power.