Scanner, Printer and Modem

Scanner:

A Scanner is a device that can transfer an image of a photograph or written information to the computer. Scanners can transfer typed text, graphs, diagrams and photographs to the computer. It acts like a photography machine. The difference is that, instead of just making another copy of it on paper, it stores it in the computer's memory .

Printer :

A Printer is a device that produces written images (numbers, alphabets, graphs, etc) on paper. After a document has been created on a computer, we can send it to a printer for a 'Hard Copy', generally known as a printout. The speed of the printer is rated either by 'pages per minute' (ppm) or by 'characters per second' (cps). Printers come in many different shapes, sizes and printing technologies.

MODEM (MOdulator and DEModulator) :

Modems are used for sending or receiving data through internet. They allow programs and data to be transmitted locally or around the world, and offer you a diverse range of features such as electronic mail, banking and travel reservations etc. A Modem enables our computer to transfer information through 'Cables' with another computer, if each has a compatible Modem. Some Modems include software that allows documents (files) created on our computer to be sent to remote FAX machines. The speed of the modem is measured in Kilobytes per second (KBPS). If the speed is higher, the transmission will be faster.