Forms: To fill in forms. The easiest way to do one-up forms is to just scan in the form and then use an image editing program, like Microsoft Paint, to type in the info. (Experts: If you use a more sophisticated editor like Paint Shop Pro, you can put the text on a separate layer so it doesn't obliterate the lines on the form.)
OCR - Businesses that want to replace paper forms with computer based forms use special OCR software to scan in the forms. (optical character recognition)