The computer hardware is the program used on the computer, the data DU for the program and the relevant ZHI documents. It determines what the computer does and how it does it. Dao is generally used to use computer hardware resources through software.

Operating system is the interface between the user and the computer. On the one hand, the operating system manages all computer system resources; on the other hand, the operating system provides users with an abstract concept of the computer. With the help of the operating system, users avoid direct operation of the computer system hardware when using the computer. For a computer system, the operating system is a collection of programs that manage all system resources. To the user, the operating system provides a simple and abstract way to effectively utilize system resources.

Application software is software that directly completes a specific application without user programming. This type of software covers the widest range of products.

Both application software and operating system are part of software.

A complete computer system consists of hardware system and software system. A computer without software is called a "bare-bones computer" and can do nothing. Hardware is the foundation and the carrier of software, and software makes the hardware have the use value. The two complement each other and are indispensable to each other.