How do a bar code reader differ from a keyboard as input device?

Answer 1

From the the user's point of view - the bar-code reader is much simpler to use. You simply point the reader at the bar-code - and it scans the sequence of black & white lines, sending data to a computer - which tells the user what the product is.

With a keyboard, you would have to enter the long string of numbers printed under the bar-code - which not only takes more time - but could be entered wrongly.

Answer 2

Yes

It puts information into computer
Yes it is... It's sole purpose is to scan the bar-code, and convert it into data for processing by either the device itself - or a computer.
Yes it is... It's sole purpose is to scan the bar-code, and convert it into data for processing by either the device itself - or a computer.

Answer 3

A barcode reader, like any scanner, takes data from a barcode and transfers it to a computer system. Any device that takes data and pushes it to a computer is an input device.