What are the four categories of system software?
System software is mainly divided into four categories:
1. Operating system
Features: In computer software The most important and basic of them is the operating system (OS). It is the lowest level software. It controls all programs running on the computer and manages the resources of the entire computer. It is the bridge between the bare metal of the computer, applications and users. Without it, users cannot use a certain software or program.
The operating system is the control and management center of the computer system. From a resource perspective, it has four functions: processor, memory management, device management, and file management.
Commonly used systems include DOS operating system, WINDOWS operating system, UNIX operating system, Linux, Netware and other operating systems.
2. Language processing program
Features: The computer can only directly recognize and execute machine language, so to run high-level language programs on the computer, a program language translation program must be equipped , the translation program itself is a set of programs, and different high-level languages have corresponding translation programs.
Language processing programs such as assembly language assembler, C language compiler, connector, etc.
3. Database management
Features: The database management system stores large amounts of data in an organized and dynamic manner, allowing people to use these data conveniently and efficiently.
Database management system is a large-scale software that manipulates and manages databases and is used to establish, use and maintain databases.
Foxpro, Access, Oracle, Sybase, DB2 and Informix are database systems.
4. Auxiliary programs
Features: System auxiliary processing programs are also called "software development tools", "support software" and "software tools". They mainly include Edit programs, debug programs, equip and connect programs, debug programs.
Extended information
Main features of the operating system:
1. Concurrency
Concurrency (Concurrence) refers to the execution of two or more running programs at the same time within the same time interval.
2. Sharability
Sharing means that the resources in the operating system (including hardware resources and information resources) can be used by multiple concurrently executing processes.
3. Asynchronous nature
In a multiprogramming environment, multiple processes are allowed to execute concurrently. Due to limited resources and many processes, in most cases, the execution of the process is not consistent to the end, but " stop-and-go".
Classification of operating systems
1. Single-user operating system
2. Batch operating system
3.Real-time operation System
4, time-sharing operating system
5, network operating system
6, distributed operating system
7, microcomputer operating system
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