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A computer is a machine that can be programmed to automatically carry out sequences of arithmetic or logical operations ( computation ). Modern digital electronic computers can perform generic sets of operations known as programs. These programs enable computers to perform a wide range of tasks. The term computer system may refer to a nominally ...
An operating system ( OS) is system software that manages computer hardware and software resources, and provides common services for computer programs . Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, peripherals, and ...
Types of computer systems Personal computer Basic hardware components of a personal computer, including a monitor, a motherboard, a CPU, a RAM, two expansion cards, a power supply, an optical disc drive, a hard disk drive, a keyboard and a mouse Inside a custom-built computer: power supply at the bottom has its own cooling fan
Information science. Information technology ( IT) is a set of related fields that encompass computer systems, software, programming languages, and data and information processing, and storage. [1] IT forms part of information and communications technology (ICT). [2] An information technology system ( IT system) is generally an information ...
Personal computer. An artist's depiction of a 2000s-era desktop-style personal computer, which includes a metal case with the computing components, a display monitor and a keyboard (mouse not shown) A personal computer, often referred to as a PC, is a computer designed for individual use. [1] It is typically used for tasks such as word ...
Information and communications technology ( ICT) is an extensional term for information technology (IT) that stresses the role of unified communications [1] and the integration of telecommunications ( telephone lines and wireless signals) and computers, as well as necessary enterprise software, middleware, storage and audiovisual, that enable ...
This offers several advantages. Computer programmers no longer need to worry about where their data is physically stored or whether the user's computer will have enough memory. The operating system will place actively used data in RAM, which is much faster than hard disks.
Digital radiography. Digital radiography is a form of radiography that uses x-ray–sensitive plates to directly capture data during the patient examination, immediately transferring it to a computer system without the use of an intermediate cassette. [1] Advantages include time efficiency through bypassing chemical processing and the ability ...
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