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A printer is device that produces a hard copy which store in computer in machine form. That is may be human readable form image form. Basically computer is attached with computer by printer cable. Many modern printers can directly interface to electronic media such as memory sticks or memory cards, or to image capture devices such as digital cameras, scanners; some printers are combined with a scanners and/or fax machines in a single unit.

Printer are generally slow device its processing speed much less than any other machine as photo state machine or printing press. And there is no setup time to achieve a hard copy of a given document. Whenever any printer is connecting with a scanner can essentially function as a photocopier. A printer receives the data in the form of:

• A string of character
• A bitmap image
• A vector image

Now days there are various types of data available in market such as:
• Toner-based printers
• Liquid inkjet printers
• Solid Ink printers
• Daisy wheel printers
• Dot-matrix printers
• Line printers
• Typewriter-derived printers

The speed of early printers was measured in units of characters per second. While modern printers are measured in pages per minute. These measures are used primarily as a marketing tool, and are not well standardized. Usually pages per minute refer to sparse monochrome office documents, rather than dense pictures which usually print much more slowly. Color printer can produce images of multiple colors. A photo printer is a color printer that can produce images.

Printer technology that is often forgotten is resistance to alteration: liquid ink such as from an inkjet head or fabric ribbon becomes absorbed by the paper fibers, so documents printed with liquid ink are more difficult to alter than documents printed with toner or solid inks, which do not penetrate below the paper surface

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