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A scanner is a device that captures images from photographic prints, posters, magazine pages, and similar sources for computer editing and display. Scanners come in hand-held, feed-in, and flatbed types and for scanning black-and-white only, or color. Very high resolution scanners are used for scanning for high-resolution printing, but lower resolution scanners are adequate for capturing images for computer display. Scanners usually come with software, such as Adobe's Photoshop product, that lets you resize and otherwise modify a captured image.

Scanners usually attach to your personal computer with a Small Computer System Interface ( SCSI ). An application such as PhotoShop uses the TWAIN program to read in the image.

Some major manufacturers of scanners include: Epson, Hewlett-Packard, Microtek, and Relisys.

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What is scanner? - Definition from WhatIs.com

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A scanner is a device that captures images from photographic prints, posters, magazine pages, and similar sources for computer editing and display. Scanners come in hand-held, feed-in, and flatbed types and for scanning black-and-white only, or color. Very high resolution scanners are used for scanning for high-resolution printing, but lower resolution scanners are adequate for capturing images for computer display.

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A microphone is a device that captures audio by converting sound waves into an electrical signal. This signal can be amplified as an analog signal or may be converted to a digital signal, which can be processed by a computer or other digital audio device.

While all microphones (or "mics") serve the same basic function, they can capture audio in several different ways.

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A projector is an output device that projects an image onto a large surface,such as a white screen or a wall.The projector can be used in the classroom for teachers to create  bulleted power point presentation.

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A headset is an output device used by adults or children for communication with the mic which is an input device, games, listening to music, games, taking private calls or listen to something loud without disturbing anyone.
Some headsets are colourfull and some glow.

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A digital camera  is a device that can store pictures, and a USB cable
can transfer the pictures to a computer

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A trackball is an input device used to enter motion data into computers or other electronic devices. It serves the same purpose as a mouse but it is designed with a move-able ball on the top, which can be rolled in any direction.
A trackball can be useful for persons who get pain in their wrists after long stints at the computer, especially if they are using the standard mouses. When the mouse is held in a ‘claw-like’ position, it causes your palm to be parallel to the desk, and it keeps your forearm in a perpetually twisted state. Twisting your wrist to the left or right as you point and click, can cause further stress. And that’s where the trackball comes in. The trackball, completely stationary, lets you dial in a comfortable, relaxed position and keeps it all day, while simultaneously freeing up your desk for mugs, post-its, chargers — whatever you want. https://padlet.com/referrals/samueldemar11

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MICR which means Magnetic Ink Character Recognition is an input device . It is a character recognition technology used to verify the legitimacy or originality of paper document.
MICR can be useful at banking industry to ease the processing and clearance of cheques and other documents.

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A sound card is a card like device that is grooved and controls the audio, it is also both an input and output .This device can be useful for doing slide shows with a projector or for a DJ that uses a computer so he can amplify his sound by connecting to a loud speaker.

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A graphics tablet is a computer input device that enables a user to hand-draw images, animations, and graphics, with a special pen-like stylus, similar to the way a person draws images with a pencil and paper. It can be useful in designing graphical things that cannot be done in the traditional way (hand-drawn) for companies or personal material.

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A bar code reader is a scanner that can read printed bar codes, decode the data contained in the bar code and send the data to the computer.