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A computer is a device that can be instructed to car
A computer is a device that can be instructed to carry out
an arbitrary set of arithmetic or logical operations automatically. The ability
of computers to follow generalized sequences of operations, called programs,
enable them to perform a wide range of tasks.
Such computers are:
used as control systems for a very wide
variety of industrial and consumer devices. This includes simple special purpose devices like microwave ovens and remote controls, factory devices such as industrial robots and computer assisted design, but also in general purpose devices like personal computers and mobile devices such as smartphones. The Internet is run on computers and it connects millions of other computers.
Since ancient times, simple manual devices like the abacus
aided people in doing calculations. Early in the Industrial Revolution, some
mechanical devices were built to automate long tedious tasks, such as guiding
patterns for looms. More sophisticated electrical machines did specialized
analog calculations in the early 20th century. The first digital electronic
calculating machines were developed during World War II. The speed, power, and
versatility of computers has increased continuously and dramatically since
then.
Conventionally, a modern computer consists of at least one
processing element, typically a central processing unit (CPU), and some form of
memory. The processing element carries out arithmetic and logical operations,
and a sequencing and control unit can change the order of operations in
response to stored information. Peripheral devices include input devices
(keyboards, mice, joystick, etc.), output devices (monitor screens, printers,
etc.), and input/output devices that perform both functions (e.g., the
2000s-era touchscreen). Peripheral devices allow information to be retrieved
from an external source and they enable the result of operations to
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A computer is a device that can be instructed to carry out an arbitrary set of arithmetic or logical operations automatically. The abilit...
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