•       
A computer keyboards are typewriter-style device which uses
an arrangement of buttons or keys to act as a mechanical laver or electronic
switch.

•       
There are mainly two types of keyboards: –

1.   
Standard layout type   

2.   
Non-Standard layout type

•       
 Standard Type
Keyboards :

•       
Apple Macintosh Keyboards

The Apple Keyboards are the keyboard designed by Apple Inc.
first for the Apple line, then the Macintosh line of computers. Dozens of
models have been released over time, including the Apple Extended Keyboard.
There are currently two keyboards offered by Apple: a full-sized version using
USB, and the Apple Magic Keyboard, which connects via Bluetooth and omits the
numeric keypad of the full-sized model.

•       
Ergonomic Keyboards

An ergonomic keyboard is a computer keyboard designed with
ergonomic considerations to minimize muscle strain and a host of related
problems.1 Typically such keyboards for two-handed typists are constructed in
a V shape, to allow right and left hands to type at a slight angle more natural
to the human form.

•       
PS/2 Keyboards

 

•       
QWERTY Keyboards

QWERTY is a keyboard design for Latin-script alphabets. The
name comes from the order of the first six keys on the top left letter row of
the keyboard (Q W E R T Y). The QWERTY design is based on a layout created for
the Sholes and Glidden typewriter and sold to Remington in 1873. It became
popular with the success of the Remington No. 2 of 1878, and remains in
widespread use.

•       
DVORAK Keyboards

The Dvorak Simplified Keyboard (/d(?)?v??ræk/ (About this
sound listen) d(?)-VOR-ak) is a keyboard layout patented during 1936 by Dr.
August Dvorak and his brother-in-law, Dr. William Dealey. Several modifications
have since been designed by the team directed by Dvorak or by ANSI. These
variations have been collectively or individually termed the Simplified
Keyboard or American Simplified Keyboard, but they all have come to be known
commonly as the Dvorak keyboard or Dvorak layout.

•       
USB Keyboards

 

 

 

 

 

 

•       
Non Standard Type Keyboard :

•       
Chorded Keyboard

A keyset or chorded keyboard (also
called a chorded keyset, chord keyboard or chording keyboard) is a computer
input device that allows the user to enter characters or commands formed by
pressing several keys together, like playing a “chord” on a piano. The
large number of combinations available from a small number of keys allows text
or commands to be entered with one hand, leaving the other hand free. A
secondary advantage is that it can be built into a device (such as a
pocket-sized computer or a bicycle handlebar) that is too small to contain a
normal-sized keyboard.

 

•       
Software Keyboard

A virtual keyboard is a software
component that allows a user to enter characters.1 A virtual keyboard can
usually be operated with multiple input devices, which may include a
touchscreen, an actual computer keyboard and a computer mouse.

 

•       
Projection Keyboard

A projection keyboard is a form of
computer input device whereby the image of a virtual keyboard is projected onto
a surface: when a user touches the surface covered by an image of a key, the
device records the corresponding keystroke. Some connect to Bluetooth devices,
including many of the latest smartphone, tablet, and mini-PC devices with
Android, iOS or Windows platform.

 

•       
Optical Keyboard

 

 

•       
Touchscreen Keyboard are also used in various fields.

 

 

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