Operating system is a computer program that manages computer hardware and software resources, and is also the core and cornerstone of computer system. Operating systems need to deal with such basic tasks as managing and configuring memory, determining the order of supply and demand of system resources, controlling input and output devices, operating networks and managing file systems. The operating system also provides an interface for users to interact with the system.

Unix system：

The so-called Unix-like family refers to a wide range of OS, including System V, BSD and Linux. Since Unix is the registered trademark of The Open Group, it refers specifically to the operating system that complies with the company's defined behavior. Unix-like OS usually refers to an OS that contains more features than the original Unix.

Unix-like systems can run under very many processor architectures and have high usage on server systems, such as universities or engineering application workstations.

Microsoft Windows：

Microsoft Windows series operating system is a graphics operating system based on MS-DOS designed by Microsoft for IBM machine. Windows system is also used on low-level and middle-level servers, and supports some functions such as database services for web services. Recently, Microsoft has spent a lot of money on research and development to enable Windows to run large-scale enterprise programs. Windows 10 OS has greatly improved its usability and security. In addition to integrating new technologies such as cloud services, smart mobile devices, natural human-computer interaction, it also optimizes and supports hardware such as solid-state hard disk, biometrics, high-resolution screen and so on. .

MacOS X:

MacOS, formerly known as "MacOS X" or "OS X", is an operating system running on Apple Macintosh computers. Mac OS is the first successful graphical user interface system in business.

Chrome OS:

Google Chrome OS is a lightweight, web-based computer operating system plan for Google, which is based on the Linux kernel of Google Chrome, its browser.