For an account of the words periphery and peripheral as they are used in biology, sociology, politics, computer hardware, and other fields, see the periphery disambiguation page.

A peripheral is a piece of computer hardware that is added to a host computer ,i. Typical PC hardware A typical Personal computer consists of a case or chassis in a tower shape (desktop and the following parts Motherboard A computer is a Machine that manipulates data according to a list of instructions. e any hardware except the computer, in order to expand its abilities. More specifically, the term is used to describe those devices that are optional in nature, as opposed to hardware that is either demanded or always required in principle.

The term also tends to be applied to devices that are hooked up externally, typically through some form of computer bus like USB. In Computer architecture, a bus is a subsystem that transfers data between computer components inside a Computer or between computers Typical examples include joysticks, printers and scanners. A joystick is an input device consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling Historical precedent Scanners can be considered the successors of early telephotography input devices consisting of a rotating drum with a single Photodetector at Devices such as monitors and disk drives are not considered peripherals when they are not truly optional. A visual display unit, often called simply a monitor or display, is a piece of Electrical equipment which displays images generated from the Video Disk storage is a general category of a Computer storage mechanisms in which data is recorded on planar round and rotating surfaces ( disks, discs, or

Some people do not consider internal devices such as video capture cards to be peripherals because they are added inside the computer case; for them, the term peripherals is reserved exclusively for devices that are hooked up externally to the computer. A Video processing expansion card is a computer Expansion card that allows a computer to receive television signals record video and/or playback video content It is debatable however whether PCMCIA cards qualify as peripherals under this restrictive definition, because some of them go fully inside the laptop, while some, like WiFi cards, have external appendages. In Computing, PC Card (originally '''PCMCIA''', or PCMCIA Card is the Form factor of a peripheral interface designed for Laptop computers Wi-Fi (ˈwaɪfaɪ is the trade name for the popular wireless technology used

Due to these considerations, the term has somewhat fallen out of modern usage; it was mainly used in the early days of the home computer boom to refer to things like floppy disk drives and modems. A home computer was a class of Personal computer entering the market in 1977 and becoming common during the 1980s A floppy disk is an increasingly Obsolete data storage medium that is composed of a disk of thin flexible ("floppy" Magnetic storage medium encased Modem (from mo dulator- dem odulator is a device that modulates an analog carrier signal to encode Digital information Today most devices are integrated inside the computer's case, and external devices typically function on their own such as mp3 players and cell phones.

The term is different from computer accessories: Computer peripheral has a narrow meaning that refers only to the input output devices of a computer, whereas, computer accessories has a broader meaning, that refers, all the parts that support a computer which includes motherboards, sensors, chips, including all the input and output devices.

List of common peripherals

• Storage
  • Removable (Writes/reads portable media)
    • CD
      • CD-ROM
      • CD-RW
      • CD-R
    • DVD
      • DVD-ROM
      • DVD-RW
      • DVD-R
    • HD DVD
      • HD DVD-ROM
      • HD DVD-R
      • HD DVD-RW
      • HD DVD-RAM
      • HD DVD/DVD-RW Combo
    • Blu-ray Disc
      • BD-ROM
      • BD-RW
      • BD-R
      • BD/DVD-RW Combo
    • USB flash drive
    • Tape drive
    • Floppy disk
    • Punch card
  • Non-removable
    • Disk drive
    • Disk array controller

Input

Main article: Input device

• • Manual
    • Keyboard
    • Pointing devices
      • Mouse
      • Trackball
      • Joystick
      • Touch screen
    • Gamepad
  • Power Cord/Transformer
  • Microphone
  • Brain-computer interface
  • Image scanner
  • Computer terminal
  • Computer speech recognition
  • Webcam
  • Digitizing tablet
  • Barcode reader

• Output (see also output device, display device, graphical output device, computer display)

Main article: output device

• • Printing
    • Plotter
    • Printer
    • Braille embosser
  • Sound
    • Computer speech synthesis
    • Sound card
    • Speakers
  • Visual
    • Digital Camera
    • Graphics card
    • Monitor
  • Refreshable Braille display
• Networking
  • Modem
  • Network card
• Expansion
  • docking station
• except memory and processor

See also

• Peripheral device
• Expansion card
• Computer hardware

Computer data storage, often called storage or memory, refers to Computer components devices and recording media that retain digital A Compact Disc (also known as a CD) is an Optical disc used to store digital data, originally developed for storing digital audio CD-ROM (an initialism of "Compact Disc Read-Only Memory " is a pre-pressed Compact Disc that contains data accessible to but not writable Compact Disc ReWritable (CD-RW is a rewritable Optical disc format A CD-R ( C ompact D isc- R ecordable is a variation of the Compact Disc invented by Philips and Sony. DVD (also known as " Digital Versatile Disc " or " Digital Video Disc " - see Etymology)is DVD (also known as " Digital Versatile Disc " or " Digital Video Disc " - see Etymology)is A DVD-RW disc is a rewritable Optical disc with equal storage capacity to a DVD-R, typically 4 DVD-R is a DVD recordable format A DVD-R typically has a storage capacity of 4 not insert the publicly disclosed HD DVD key into this article for the time being not insert the publicly disclosed HD DVD key into this article for the time being not insert the publicly disclosed HD DVD key into this article for the time being not insert the publicly disclosed HD DVD key into this article for the time being not insert the publicly disclosed HD DVD key into this article for the time being Blu-ray Disc recordable (or BD-R) refers to two Optical disc formats that can be recorded with an Optical disc recorder. A tape drive, which is also known as a streamer, is a data storage device that reads and writes data stored on a magnetic tape. A floppy disk is an increasingly Obsolete data storage medium that is composed of a disk of thin flexible ("floppy" Magnetic storage medium encased Disk storage is a general category of a Computer storage mechanisms in which data is recorded on planar round and rotating surfaces ( disks, discs, or A disk array controller is a device which manages the physical Disk drives and presents them to the computer as logical units. Input is the term denoting either an entrance or changes which are inserted into a System and which activate/modify a Process. An input device is any Peripheral (piece of Computer hardware equipment used to provide data and control signals to an information processing system (such as a In Computing, a keyboard is an Input device partially modelled after the typewriter keyboard which uses an arrangement of buttons or keys A pointing device is an Input interface (specifically a Human interface device) that allows a user to input spatial (ie continuous and multi-dimensional data In Computing, a mouse (plural mice, mouse devices, or mouses) A trackball is a Pointing device consisting of a Ball housed in a socket containing sensors to detect rotation of the ball about two axes&mdashlike an upside-down A joystick is an input device consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling A Touch Screen is a display which can detect the presence and location of a touch within the display area A gamepad, also called joypad or control pad, is a type of Game controller held in the hand where the digits (especially thumbs are used to provide input For a musical note played on an electric guitar see Power chord A power cord, line cord, or mains cable is a Cord or Cable A transformer is a device that transfers Electrical energy from one circuit to another through inductively coupled Electrical conductors A brain-computer interface (BCI sometimes called a direct neural interface or a brain-machine interface, is a direct communication pathway between a human or animal Historical precedent Scanners can be considered the successors of early telephotography input devices consisting of a rotating drum with a single Photodetector at A computer terminal is an electronic or electromechanical hardware device that is used for entering data into and displaying data from a Computer or a Computing Speech recognition (also known as automatic speech recognition or computer speech recognition) converts spoken words to machine-readable input (for example to keypresses Webcams ( web cameras) are small cameras (usually though not always Video cameras, whose images can be accessed using the World Wide Web, instant A graphics tablet (or digitizing tablet, graphics pad, drawing tablet) is a computer Input device that allows one to hand-draw images and graphics A barcode reader (or barcode scanner) is an electronic device for reading printed Barcodes Like a Flatbed scanner, it consists of a light source a lens Output is the term denoting either an exit or changes which exit a System and which activate/modify a Process. An output device is any piece of Computer hardware equipment used to communicate the results of Data processing carried out by an Information processing system A display device is an Output device for presentation of Information for Visual or Tactile reception acquired stored or transmitted A visual display unit, often called simply a monitor or display, is a piece of Electrical equipment which displays images generated from the Video An output device is any piece of Computer hardware equipment used to communicate the results of Data processing carried out by an Information processing system A plotter is a Vector graphics printing device that connects to a Computer. A Braille embosser is a printer, necessarily an Impact printer, that renders text as Braille. Speech synthesis is the artificial production of human speech. A sound card (also known as an audio card is a Computer Expansion card that facilitates the input and output of audio signals to/from a computer under For the Marty Friedman album see Loudspeaker (album A loudspeaker, speaker, or speaker system is an electroacoustical Many compact digital still cameras can record Sound and moving Video as well as still Photograph. A video card, also known as a graphics accelerator card, display adapter, or graphics card, is a hardware component whose function is to A visual display unit, often called simply a monitor or display, is a piece of Electrical equipment which displays images generated from the Video A refreshable Braille display or Braille terminal is an electro-mechanical device for displaying Braille characters usually by means of raising dots through holes A computer network is a group of interconnected Computers. Networks may be classified according to a wide variety of characteristics Modem (from mo dulator- dem odulator is a device that modulates an analog carrier signal to encode Digital information A Network card, Network Adapter, LAN Adapter or NIC (network interface card is a piece of Computer hardware designed to allow computers Docking stations and port replicators provide a simplified way of "plugging-in" a portable Laptop computer to common computer peripherals In Computer hardware, a peripheral device is any device attached to a computer in order to expand its functionality (basically input and output devices together are known An expansion card (also expansion board, adapter card or accessory card) in Computing is a Printed circuit board that can be inserted Typical PC hardware A typical Personal computer consists of a case or chassis in a tower shape (desktop and the following parts Motherboard

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