A printer is a device that prints documents and images onto physical materials such as paper. Printers can be connected to computers so that users can use software programs such as word processors and digital cameras to create documents to print.
Different printers have varying capabilities and costs. The choice of a printer depends on the type and size of documents to be printed as well as the desired speed, quality, and permanence. Other considerations include noise and power consumption.
Inkjet printers print text and graphics using a fixed set of characters on a rotating drum, which moves over the paper to create a visible image. They can also copy and scan items and print files from a USB drive. The cost of ink and paper varies depending on the brand and model.
Laser printers use toner powder that is attracted by a laser or LED light to areas of the drum where the intended image is. A series of rollers then transfer the toner to the paper, where it is fused with heat. Laser printers can be more expensive than inkjet printers, but they offer higher-quality printing and can print on thicker papers.
Dot matrix printers charge dots on a ribbon of aluminum-coated silver paper in a serial fashion, creating a black image on the paper. They can also produce bar codes and other special-purpose printers. Daisy wheel and band printers use a set of character slugs on a rotating chain or belt, respectively, to create an image on a band that travels horizontally past the print head.
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