A printer gives hard output on the paper. The soft output of the computer can be seen on the monitor or visual display unit. Small number of pages is printed by using small printers but huge number of pages is printed with the help of line printers. The line printers are used with mainframe computers.

Printer is very useful for different purposes of human beings. They print the important document in paper such as bio data, certificate, letter, reports, and important news in paper and so on. They record these important documents for future and other purposes. Printer makes it easy to do work properly in all kind of official and non official work.