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A computer is a machine which
manipulates data according to a list of instructions which makes
it an ideal example of a data processing system.
Computers take numerous physical forms. The first devices that
resemble modern computers date to the mid-20th century (around
1940 - 1941), although the computer concept and various machines
similar to computers existed prior. Early electronic computers
were the size of a large room, consuming as much power as
several hundred modern personal computers. Modern computers are
based on comparatively tiny integrated circuits and are millions
to billions of times more capable while occupying a fraction of
the space. Today, simple computers may be made small enough to
fit into a wrist watch and be powered from a watch battery.
Personal computers in various forms are icons of the information
age and are what most people think of as "a computer". However,
the most common form of computer in use today is by far the
embedded computer. Embedded computers are small, simple devices
that are often used to control other devices — for example, they
may be found in machines ranging from fighter aircraft to
industrial robots, digital cameras, and even children's toys.Microsoft
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The ability to store and execute lists of instructions called
programs makes computers extremely versatile and distinguishes
them from calculators. The Church – Turing thesis is a
mathematical statement of this versatility: Any computer with a
certain minimum capability is, in principle, capable of
performing the same tasks that any other computer can perform.
Therefore, computers with capability and complexity ranging from
that of a personal digital assistant to a supercomputer are all
able to perform the same computational tasks given enough time
and storage capacity. |
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