The operating system is essential software that manages hardware resources and allows users to run application programs. It controls the overall functions of the computer. Examples of operating systems include Mac OS X, AmigaOS, Ubuntu Linux, and Microsoft Windows. Linux was originally developed as an open-source alternative to Unix and is now widely used as a server operating system and in devices like tablets, phones, and game consoles. The document expresses a personal opinion that Linux is an excellent operating system because it is easy to use, fast, and lacks viruses.