An automatic document feeder (ADF) is a feature in printers, photocopiers, fax machines or scanners wherein a stack of paper put into the machine and is then automatically fed through it, allowing the user to print, scan or copy without having to manually place each page into the machine.
There are two kinds of ADFs that are capable of duplex scanning:
An ADF is a standard feature for most printers, fax machines and large photocopiers, but scanners typically lack ADFs, although they may have them as an add-on feature. Flatbed scanners are designed without ADFs.
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