The categories of computers and their uses
The
six major categories of computers are personal computers, handheld computers,
Internet appliances, mid-range servers, mainframes, and supercomputers. These
categories are based on differences in size, speed, processing capabilities,
and price.
A personal computer
can perform all of
its input, processing, output, and storage activities by itself. Personal
computers include desktop computers and notebook computers.
A
desktop computer
is designed so the system unit, input devices, output
devices, and any other devices fit entirely on or under a desk or table.
Variations of desktop computers include tower models (computers with
tall and narrow system units that can sit vertically on the floor), all-in-one
computers (less expensive computers that combine the monitor and system
unit into a single device), and
workstations (more expensive and
powerful computers designed for work that requires intense calculation and
graphics capabilities).
A
notebook computer
is a portable personal computer small enough fit on
your lap. Notebook and desktop computers are used at home or in the office to
perform application software-related tasks or to access the Internet.
A
handheld computer
is a small computer that fits in your hand. Handheld
computers can perform specific, industry-related functions, or can be
general-purpose.
A
PDA (personal digital assistant)
is a handheld computer that
provides personal organizer functions, such as a calendar, appointment book,
and notepad.
An
Internet appliance
is a computer with limited functionality whose main
purpose is to connect to the Internet from home.
A mid-range server is more powerful and
larger than a workstation computer. Users typically access a mid-range server
through a personal computer or a terminal, which is a device with a
monitor and a keyboard that usually has no stand-alone processing power.
A
mainframe
is a large, expensive, very powerful computer that can handle hundreds
or thousands of connected users simultaneously.
A supercomputer
is the
fastest, most powerful, and most expensive category of computer.
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