The user's view of the computer varies according to the interface being used. Many computer users sit with a laptop or in front of a PC consisting of a monitor, keyboard, and mouse. Such as system is designed for one user to monopolize ifs resource. 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 security and none paid to resource utilization-how various hardware and software and software resources and shared.
user
application programs
(compilers, web browsers, development kits, etc)
operating system
computer hardware
(cpu, memory, I/O devices, etc)
Increasingly, many users interact with mobile devices such as smartphones and tablets-devices that are replacing desktop and laptop computer systems for some users. These devices are typically connected to networks through cellular or other wireless technologies. The user interface for mobile computers generally features a touch screen, where the user interacts with the system by pressing and swiping fingers across the screen rather than using a physical keyboarod and mouse. Many mobile devices also allow users to interact through a voice recognition interface, such as Apple's Siri.
Some computers have little or no user view. For example, embedded computers in home devices and automobiles may have numeric keypads and may turn indicator lights on or off to show status, but they and their operating systems and application are designed primarily to run without user intervention.
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