SCANNER TYPE DESCRIPTION USE
ALL IN ONE A device that has multiple devices in one hard ware  home/small office
FLATBED scanning books, portable,cheap home use  home/ small office
HAND HELD very portable used to scan bar codes  supermarket
DRUM used in commercial operations being replaced by flat bed used in high end reproductions. does not damage  museum

this is a  small description of low  andwhere a scanner is used