MacOS is Apple’s OS, which mainly runs on Apple’s PC hardware. There are several versions of the Mac OS, but the latest version is a single-user, multitasking OS based on UNIX. The main feature of Mac OS is the user interface by GUI like Windows. The operation usually uses a mouse with a single button. Mac OS has detailed guidelines for application interfaces, so operations are often similar even if the applications differ. In addition to daily use, Mac OS is used in fields such as music production, graphic production, and publishing.