To be distinguished from the physical or hardware components of a computer, programs are collectively referred to as software. A computer system, therefore, is a computer combined with peripheral equipment and software so that it can perform desired functions.
A computer is a device that does certain things (mostly very basic data manipulation and mathematical functions), just as a building is a device that does certain things (such as housing offices or apartments). What makes a computer special is that it does these things very very quickly. A computer system is a mechanism that incorporates multiple computers along with other things like data storage devices, networks, and data paths (ways to move data around among storage devices and computers), as well as software (rules for how to do things), procedures and processes and protocols and on and on. A computer system performs a rather complex function, just as a city is a system that involves multiple buildings along with roads, sewage treatment plants, water and electrical systems and many other things that enable it to perform a function considerably more complex than the function performed by a building.
A major advance in the field of computing was the advent of networking. Before that, computers had to be near each other in order to communicate with each other and computer systems typically existed in a relatively small physical location where all the computers were in the same place. If you see a movie released in the period from roughly 1950 to 1980, you will note that computers and computer systems were typically depicted as gigantic things located in a large room. With networking, a computer system might have computers in one place, remote access devices in another place, and other computers in other places. Thus a building might have computers and terminals and printers and what have you all over it, all capable of communicating with each other. The internet, which enables world wide networks, has made it possible to have computer systems that consist of thousands of computers (or more), located all over the globe.
a computer is like an engine whereas a computer system is like a vehicle (a car or truck or boat) that contains one or more engines and does something more complex than what the engine does. But the engine is the essential component that enables the vehicle to do what it does. a computer exists in a single place and does a primitive set of functions. A computer system combines a computer with many other things to perform a complex set of functions. It can also exist in a single place, but it may exist in many places at the same time.
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