ADF is an acronym of “Automatic Document Feeder” with the help of it several pages can be copied and scanned in copiers and scanners respectively in one time without inserting them individually in both devices.

A duplexing automatic document feeder or DADF scans both sides in one pass. The advantage of the DADF is faster speed for two-sided originals. RADFs and DADFs are rated in images per minute (IPM), the number of sides they can scan each minute.

This may depend upon the resolution being used (rather than the maximum resolution
It helps the user to complete the work easily without wasting of time.

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Alexander Graham Bell (March 3, 1847 – August 2, 1922) was a Scottish-born scientist, inventor, engineer, and innovator who is credited with patenting the first practical telephone.