•       A computer keyboards are typewriter-style device which usesan arrangement of buttons or keys to act as a mechanical laver or electronicswitch.•       There are mainly two types of keyboards: -1.   Standard layout type   2.

   Non-Standard layout type•        Standard TypeKeyboards :•       Apple Macintosh KeyboardsThe Apple Keyboards are the keyboard designed by Apple Inc.first for the Apple line, then the Macintosh line of computers. Dozens ofmodels have been released over time, including the Apple Extended Keyboard.There are currently two keyboards offered by Apple: a full-sized version usingUSB, and the Apple Magic Keyboard, which connects via Bluetooth and omits thenumeric keypad of the full-sized model.•       Ergonomic KeyboardsAn ergonomic keyboard is a computer keyboard designed withergonomic considerations to minimize muscle strain and a host of relatedproblems.1 Typically such keyboards for two-handed typists are constructed ina V shape, to allow right and left hands to type at a slight angle more naturalto the human form.•       PS/2 Keyboards •       QWERTY KeyboardsQWERTY is a keyboard design for Latin-script alphabets. Thename comes from the order of the first six keys on the top left letter row ofthe keyboard (Q W E R T Y).

The QWERTY design is based on a layout created forthe Sholes and Glidden typewriter and sold to Remington in 1873. It becamepopular with the success of the Remington No. 2 of 1878, and remains inwidespread use.•       DVORAK KeyboardsThe Dvorak Simplified Keyboard (/d(?)?v??ræk/ (About thissound listen) d(?)-VOR-ak) is a keyboard layout patented during 1936 by Dr.August Dvorak and his brother-in-law, Dr.

William Dealey. Several modificationshave since been designed by the team directed by Dvorak or by ANSI. Thesevariations have been collectively or individually termed the SimplifiedKeyboard or American Simplified Keyboard, but they all have come to be knowncommonly as the Dvorak keyboard or Dvorak layout.

•       USB Keyboards      •       Non Standard Type Keyboard :•       Chorded KeyboardA keyset or chorded keyboard (alsocalled a chorded keyset, chord keyboard or chording keyboard) is a computerinput device that allows the user to enter characters or commands formed bypressing several keys together, like playing a “chord” on a piano. Thelarge number of combinations available from a small number of keys allows textor commands to be entered with one hand, leaving the other hand free. Asecondary advantage is that it can be built into a device (such as apocket-sized computer or a bicycle handlebar) that is too small to contain anormal-sized keyboard.

 •       Software KeyboardA virtual keyboard is a softwarecomponent that allows a user to enter characters.1 A virtual keyboard canusually be operated with multiple input devices, which may include atouchscreen, an actual computer keyboard and a computer mouse. •       Projection KeyboardA projection keyboard is a form ofcomputer input device whereby the image of a virtual keyboard is projected ontoa surface: when a user touches the surface covered by an image of a key, thedevice records the corresponding keystroke. Some connect to Bluetooth devices,including many of the latest smartphone, tablet, and mini-PC devices withAndroid, iOS or Windows platform. •       Optical Keyboard  •       Touchscreen Keyboard are also used in various fields.  

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