what is os?define os do as user view?
(dont copy from google)
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A computer system can be divided roughly into four components, they are, the hardware, the application programs, , the operating system and the users.
The hardware consists of the central processing unit (CPU), the memory, and the input/output (I/O) devices which provides the basic computing resources for the system.
The application programs such as word processors, spreadsheets, web browsers define the ways in which these resources are used to solve users computing problems. The operating system controls the hardware and coordinates its use among the various application programs for the various users.
The user’s view of the computer varies according to the interface being used. Most computer users sit in front of a PC, consisting of a monitor, keyboard, mouse, and system unit. Such a system is designed for one user to monopolize its resources. The goal is to maximize the work (or play) that the user is performing. In this case, the operating system is designed mostly for ease of use, with some attention paid to performance and none paid to resource utilization—how various hardware and software resources are shared. Performance is, of course, important to the user; but such systems are optimized for the single-user experience rather than the requirements of multiple users.
In other cases, a user sits at a terminal connected to a mainframe or a minicomputer. Other users are accessing the same computer through other terminals. These users share resources and may exchange information. The operating system in such cases is designed to maximize resource utilization — to assure that all available CPU time, memory, and I/O are used efficiently and that no individual user takes more than her fair share.
In still other cases, users sit at workstations connected to networks of other workstations and servers. These users have dedicated resources at their disposal, but they also share resources such as networking and servers, including file, compute, and print servers. Therefore, their operating system is designed to compromise between individual usability and resource utilization.
The hardware consists of the central processing unit (CPU), the memory, and the input/output (I/O) devices which provides the basic computing resources for the system.
The application programs such as word processors, spreadsheets, web browsers define the ways in which these resources are used to solve users computing problems. The operating system controls the hardware and coordinates its use among the various application programs for the various users.
The user’s view of the computer varies according to the interface being used. Most computer users sit in front of a PC, consisting of a monitor, keyboard, mouse, and system unit. Such a system is designed for one user to monopolize its resources. The goal is to maximize the work (or play) that the user is performing. In this case, the operating system is designed mostly for ease of use, with some attention paid to performance and none paid to resource utilization—how various hardware and software resources are shared. Performance is, of course, important to the user; but such systems are optimized for the single-user experience rather than the requirements of multiple users.
In other cases, a user sits at a terminal connected to a mainframe or a minicomputer. Other users are accessing the same computer through other terminals. These users share resources and may exchange information. The operating system in such cases is designed to maximize resource utilization — to assure that all available CPU time, memory, and I/O are used efficiently and that no individual user takes more than her fair share.
In still other cases, users sit at workstations connected to networks of other workstations and servers. These users have dedicated resources at their disposal, but they also share resources such as networking and servers, including file, compute, and print servers. Therefore, their operating system is designed to compromise between individual usability and resource utilization.
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