Nowadays, there are too many operating systems in our daily life, such as Microsoft Windows, Mac OS and Linux. Here, we will introduce some of them in detail.

For Windows 10, it is an operating system developed by Microsoft for computers and tablets in the United States. It was released on July 29, 2015. The Windows 10 operating system has been greatly improved in terms of usability and security. In addition to integrating new technologies such as cloud services, smart mobile devices and natural human-computer interaction, it has also optimized and improved hardware such as solid-state drives, biometrics and high-resolution screens.

    Mac OS is an operating system that runs on Apple's Macintosh computers. It was the first commercially successful graphical user interface (GUI) operating system.The current version of the system is Mac OS 11.0 Beta 5, and there are also online Mac systems running on PCS. It is a graphical operating system based on XNU hybrid kernel. An operating system that cannot normally be installed on a regular PC. What's more, the computer viruses that wreak havoc almost always target Windows, and the MAC is rarely attacked by viruses because of its different architecture from Windows.

    Linux, known as GNU/Linux, is a freely usable and freely distributed UNIX-like operating system. Its kernel was first released in 1991 by Linus Benadector Torvac. Inspired by Minix and UNIX ideas, it is a POSIX and UniX-based multi-user, multi-tasking, multi-threaded, and multi-CPU operating system. It runs major Unix utility software, applications, and network protocols. It supports 32-bit and 64-bit hardware. Linux is a stable multi-user network operating system, which inherits the design idea of Unix with network as the core. There are hundreds of different distributions of Linux, such as debian based on community development, ArchLinux, and Red Hat Enterprise Linux based on commercial development, SUSE, Oracle Linux, and so on.

From my point of view, an operating system is a computer program that manages and controls the hardware and software resources of a computer and it is the first layer of software on a bare-metal machine. The operating system is the layer of software closest to the hardware. It transforms the hardware bare metal into a perfect virtual machine, so that the machine functions can be extended, the operating environment can be improved, the system efficiency can be improved, and the safety performance can be guaranteed. Meanwhile, the operating system isolates other upper layer software and provides them with interfaces and services, so that the upper layer software can obtain more and stronger functional support than the hardware can provide. Thus, the operating system is the core of the software system, which together with the computer hardware constitutes the basic operating platform of all kinds of software.