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By The Editors of Encyclopaedia Britannica
Table of ContentsKey People:Steve Jobs Bill Gates Larry Ellison Ray Kurzweil Azim Premji...[Show more]Related Topics:open source freeware malware ICQ plug-in...[Show more]
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software, instructions that tell a computer what to do. Software comprises the entire set of programs, procedures, and routines associated with the operation of a computer system. The term was coined to differentiate these instructions from hardware—i.e., the physical components of a computer system. A set of instructions that directs a computer’s hardware to perform a task is called a program, or software program.
The two main types of software are system software and application software. System software controls a computer’s internal functioning, chiefly through an operating system, and also controls such peripherals as monitors, printers, and storage devices. Application software, by contrast, directs the computer to execute commands given by the user and may be said to include any program that processes data for a user. Application software thus includes word processors, spreadsheets, database management, inventory and payroll programs, and many other “applications.” A third software category is that of network software, which coordinates communication between the computers linked in a network.
Britannica Quiz
Computers and Technology QuizSoftware is typically stored on an external long-term memory device, such as a hard drive or magnetic diskette. When the program is in use, the computer reads it from the storage device and temporarily places the instructions in random access memory [RAM]. The process of storing and then performing the instructions is called “running,” or “executing,” a program. By contrast, software programs and procedures that are permanently stored in a computer’s memory using a read-only [ROM] technology are called firmware, or “hard software.”
An operating system is the most important software that runs on a computer. It manages the computer's memory and processes, as well as all of its software and hardware. It also allows you to communicate with the computer without knowing how to speak the computer's language. Without an operating system, a computer is useless.
Watch the video below to learn more about operating systems.
Looking for the old version of this video? You can still view it here.
The operating system's job
Your computer's operating system [OS] manages all of the software and hardware on the computer. Most of the time, there are several different computer programs running at the same time, and they all need to access your computer's central processing unit [CPU], memory, and storage. The operating system coordinates all of this to make sure each program gets what it needs.
Types of operating systems
Operating systems usually come pre-loaded on any computer you buy. Most people use the operating system that comes with their computer, but it's possible to upgrade or even change operating systems. The three most common operating systems for personal computers are Microsoft Windows, macOS, and Linux.
Modern operating systems use a graphical user interface, or GUI [pronounced gooey]. A GUI lets you use your mouse to click icons, buttons, and menus, and everything is clearly displayed on the screen using a combination of graphics and text.
Each operating system's GUI has a different look and feel, so if you switch to a different operating system it may seem unfamiliar at first. However, modern operating systems are designed to be easy to use, and most of the basic principles are the same.
Microsoft Windows
Microsoft created the Windows operating system in the mid-1980s. There have been many different versions of Windows, but the most recent ones are Windows 10 [released in 2015], Windows 8 [2012], Windows 7 [2009], and Windows Vista [2007]. Windows comes pre-loaded on most new PCs, which helps to make it the most popular operating system in the world.
Check out our tutorials on Windows Basics and specific Windows versions for more information.
macOS
macOS [previously called OS X] is a line of operating systems created by Apple. It comes preloaded on all Macintosh computers, or Macs. Some of the specific versions include Mojave [released in 2018], High Sierra [2017], and Sierra [2016].
According to StatCounter Global Stats, macOS users account for less than 10% of global operating systems—much lower than the percentage of Windows users [more than 80%]. One reason for this is that Apple computers tend to be more expensive. However, many people do prefer the look and feel of macOS over Windows.
Check out our macOS Basics tutorial for more information.
Linux
Linux [pronounced LINN-ux] is a family of open-source operating systems, which means they can be modified and distributed by anyone around the world. This is different from proprietary software like Windows, which can only be modified by the company that owns it. The advantages of Linux are that it is free, and there are many different distributions—or versions—you can choose from.
According to , Linux users account for less than 2% of global operating systems. However, most servers run Linux because it's relatively easy to customize.
To learn more about different distributions of Linux, visit the Ubuntu, Linux Mint, and Fedora websites, or refer to our Linux Resources. For a more comprehensive list, you can visit MakeUseOf's list of The Best Linux Distributions.