A feeder scanner is a type of scanner equipped with an automatic document feeder, also known as an ADF (Automatic Document Feeder). This feature allows the scanner to automatically scan multi-page documents without the need to manually change pages. A scanner with a feeder is especially useful for businesses and households that regularly need to digitize large quantities of paper documents. A document feeder can typically hold between 10 and 50 sheets of paper at a time, but some more powerful models can hold more.