Assume of photocopy machine is an input device commonly called scanner use of scanner helps to store drawings, graphs, photos, and text for computer processing by passing an optical scanning mechanism over the information to be stored. It works by digitizing an image, dividing it into a grid of boxes, and representing each boxes with either a 0 or a 1, depending on the box is filled in. The resulting matrix of bits is called a bit map, which can be stored in a file and can be displayed on a screen.

We can also find optical scanner. It is capable for reading information recorded in a paper by emitting light source and light sensors. Optical Characters Readers (OCR) and Optical Mark Reader (OMR) are commonly used optical scanners.

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