Automatic document feeder (ADF): An automatic document ... critical factors such as the type of scanner (flatbed, sheet-fed, or portable), scan quality (measured in DPI or dots per inch), speed ...

The best all-in-one printers can print, copy, fax and more. Here are our top picks, from HP, Canon, Brother and more.

into a printer or scanner. Also called a "document feeder," sheet feeders range in size from only a handful of paper sheets to a couple thousand. THIS DEFINITION IS FOR PERSONAL USE ONLY.