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1, DOS operating systemDOS is short for Disk Operation System. It has been upgraded to version 6.22 since version 1.0 was released in 1981. The interface of DOS is operated by character commands and can only run a single task.2. Windows 9x/Windows ME/Windows XPWindows 9X is a multi-tasking operating system with a windowed graphical interface, which makes up for the shortcomings of DOS. Since then, Windows ME and Windows XP (2001), compared with Windows 9X, focus on adding and enhancing network connectivity, digital media, entertainment components, hardware plug and play, system restore and other functions. Windows 98 is a mass-market version of Windows, and because it evolved from DOS, after installing and running large pieces of software, the system became unstable and often crashed.3.windows xpSince Windows NT was originally designed for servers, it is much more stable than the Windows 98 operating systems.3. Windows NT/ Windows 2000Windows NT is a network operating system, it has a number of applications, management, performance, Intranet/Internet services, communications and network integration services and other aspects of the other operating systems have incomparable advantages. Therefore, it is commonly used in demanding commercial desktops, workstations, and web servers. Windows 2000 is built on the basis of The Windows NT kernel, while absorbing the advantages of Windows 9X. Therefore, Windows 2000 is easier to use and manage, more reliable, faster, more stable and safer, more complete network functions, and better entertainment effect. The most commonly used Windows servers are Windows 2003 and Windows 2008, both of which are used by large and small businesses.4, UNIXUNIX operating system design begins with minicomputer, from the beginning is a multiuser, multitasking general operating system, it provides users with an interactive, flexible operation interface, support sharing data between the user, and provide a multitude of integrated tools to improve the work efficiency of the user at the same time can be ported to different hardware platforms. The reliability and stability of UNIX operating system is unmatched by other systems, and it is recognized as the best Internet server operating system. In a sense, the backbone of the entire Internet is almost entirely built on the many machines and network devices running UNIX.5, LinuxTo be precise, Linux should be a UNIX compliant operating system, and Linix is developed in a source-based manner. Linux is a free and freely distributed UNIX-like operating system designed and implemented by thousands of programmers around the world. Users can obtain it and its source code without paying any fee, and can make necessary changes to it according to their own needs, use it for free, and continue to disseminate it without constraint. Linux is known for its efficiency and flexibility. It is capable of implementing all UNIX features on a PC, with the ability to multitask and multiuser. It also includes text editors, high-level language compilers, and other applications. It also includes an X-Windows graphical user interface with multiple window managers, allowing us to manipulate the system with Windows NT, as we do with Windows NT, using Windows, ICONS and menus. It is a powerful, high-performance, stable and reliable operating system.6. Mac OS is the special operating system for Macintosh computers, and is essentially a variant of UNIX. PostVer 0