When is a scanner used for input ? Discuss various types of scanners.

A scanner is used for input when we want to convert physical documents or images into digital format and store them on a computer or other electronic device. It allows us to create electronic versions of physical documents, photographs, or artwork.

The various types of scanners are as follows:

1. Hand-held Scanners — These are very small which can be held in a hand.
2. Flatbed Scanners — These are larger and more expensive scanners but they definitely create higher quality images. These scanners have a flat surface on which the printed image to be scanned, is placed.
3. Drum Scanners — These are medium-size scanners with a rolling drum. The sheet is fed through the scanners so that the drum rolls over the entire sheet to be scanned.