This document provides an overview of the history and types of computers. It discusses how the term "computer" originally referred to humans who performed calculations before mechanical devices took over those tasks. The document outlines several types of computers classified by size and power, including personal computers, workstations, microcomputers, minicomputers, mainframes, and supercomputers. It provides brief descriptions of each type.

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• Internet activities are
all made possible by
the availability of
different software,
also known as
computer programs.
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Introduction

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A Review on Computer History
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A computer is an electronic device
capable of performing commands.
The basic commands that a
computer performs are input (get
data), output (display results),
storage, and performance of
arithmetic and logical operations.

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• The term "computer" was
originally given to humans
(human computers) who
performed numerical
calculations using
mechanical calculators,
such as the abacus and
slide rule. The term was
later given to a mechanical
device as they began
replacing the human
computers.
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“Human Computers”

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Types of Computers
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Computers are generally classified
by size and power as follows,
although there is considerable
overlap. The differences between
computer classifications generally get
smaller as technology advances,
creating smaller and more powerful
and cost-friendly components.

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Types of Computers
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Personal computer: a small, single-
user computer based on a
microprocessor. In addition to the
microprocessor, a personal computer
has a keyboard for entering data, a
monitor for displaying information, and
a storage device for saving data.

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Types of Computers
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Workstation: a powerful,
single-user computer. A
workstation is like a personal
computer, but it has a more
powerful microprocessor and
a higher-quality monitor.

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Types of Computers
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Microcomputer: Term used to
describe a standard personal
computer. Technically, a
microcomputer has a CPU, RAM,
sound card, modem, and video
card. It is slower than other high
performing computers, such as a
server or a mainframe.

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Types of Computers
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Minicomputer: is a computer which has
all the features of a large size computer,
but its size is smaller than those. In
1996, Nokia introduced a phone that
had internet capabilities. This started a
revolution of devices that were small
portable computers.

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Types of Computers
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Mainframe: a powerful multi-user computer
capable of supporting many hundreds or
thousands of users simultaneously. A
mainframe is used by governments, schools,
and corporations for added security and
processing large amounts of data, such as
consumer statistics, census data, or
electronic transactions.

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Types of Computers
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Supercomputer: an extremely
fast computer that can perform
hundreds of millions of
instructions per second.
A computer or array of computers
that act as one collective
machine capable of processing
enormous amounts of data.