The printer is an output device that prints text or image on a physical medium such as paper, the scanner is an input device that analyzes the object image that is displayed and used by the computer. The print data is moved from the PC to a printer. But during the scan data is transferred from the scanner to the computer in digital form.

A printer is a device connected to a computer via USB or printer cables cable.But locally, there is also a network> The printers are its built-in network interface, and then use them for all computers with printers network.Some with many others who also functions as printing, copying, scanning, etc, and are known as multifunction printers or all – in-one printers. After a delay to give orders, and printing done at one time is full, you can not have another job with a computer because the system is in a buffer and execute in order. This simultaneous treatment offunctions are called with the code.

Printers are generally classified into two types, namely, impact and non impact printers. With impact printers, there will be a link between the paper and the printing mechanism. Dot matrix printers, printer font, line printers Daisy-wheel printers, thermal printers, etc. fall into this category. In the matrix, there will be a series of pins on the ribbon strike globes to produce imagespaper. Typefaces, there will be a series of bars with signs on them that looks at the signs marked on the paper tape. Daisy wheel printer uses a metal or plastic wheels, and you can print your own signs. Calculators, fax include thermal printers. Line Printers are always first. These printers effects are not reversed by spanking power printers, which have no direct contactbetween the paper and the mechanism. inkjet and laser printers of this type of sensation in color printing. In inkjet printers, small head nozzles spray ink droplets to produce images on paper.

Scanners are hardware devices that the text or images, then capture and process data are converted into digital form of analysis will be obtained and displayed by the computer. The scanner may have different levels of voltage analog to digital converters.Scanners include OCR software that manages the text or image. CCD array, a series of small light-sensitive diode, is the central part of the scanner. These diodes or photo sites to change the photons in electric charges. Each site photography is sensitive to light and time burdens accordingly. Different filters, lenses are present in the scanner. The scanner can be connected to a printer, and you can print copies of the object makes you scan. If it is connected to the computer via a USB cable, you canscan images on your PC. Flatbed scanners are simple and one swarm. In sheet fed scanner, which scanned the object moves, the scan head is hard and fast. Hand-held scanners require the user to switch to take pictures. Drum scanners use photomultiplier technology to capture large images and are used in the publishing industry.

Mono-chrome printers produce color images and is large and black. Color printer to produce color images.Scanners usually opens the door for the RGB data from the matrix. The data will be processed and sent to the computer. Banks scanning array characteristics, depth of color varies. The resolution is measured in pixels per inch.

The printers are everywhere these days. They are used in offices, schools, universities, hospitals, factories, shops, etc. It is so bad that it can connect directly to digital cameras, etc. 3D scanners are used in industrial design, analysis, game overand measurement, orthodontics, etc. planetary scanner used to scan books, documents, etc., large scanners are also used in photography, biomedical research, etc.

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