what is printer?explain by the scanner and speaker?

what is printer?explain by the scanner and speaker?

PRINTER:                the printer is a machine connected to the computer to print the output on paper. there are different types of printe... 20:30

PRINTER:
               the printer is a machine connected to the computer to print the output on paper. there are different types of printer, which work on different technologies. Dot Matrix, inkjet and laser printers are very popular technologies which are in use now-a- days.

A Dot matrix printer (DMP) is used for quantity and not for quality printing. This is an economical printer, and used by data processing centers and schools. inkjet printer is used in offices where co-lour printers are needed for demonstration or presentation. it is not very costly but still expensive because after about 500 copies the co-lour cartridge is to be replaced. ho-were, for co-lour prints this printer is very popular in the market.

laser printer is the fastest and the best quality printer but it is very costly. they are useful in publishing houses. the printing technology is similar to that of the xerox machine so the text or graphics printed by this printer are very clear and shop. the printed matter of this page is an example of the laser print.
SCANNER:
                   the scanner is a graphic input device. this device is specially used to transfer pictures and photographs into the computer directly. for the picture or photograph that you want to get into the computer for editing, first put it in the scanner and then, by using some commends, you can get it on the computer screen.
SPEAKER:
                 the speech that you have recorded in the computer can be listened to by using speakers. speakers convert the electronic signals into the audio (sound). if you want to listen any music or song, you can insert  the audio CD or CD-ROM drive and play it. thus you can listen the music or song through the speaker.