SCANNER

A Scanner is an input devices which is capable  of reading the image present on a piece paper and transferring the information into a computer where  a program can store and interpret it. The information is an the from  of a graphic image or picture and not in the  form of text. Even if the paper  contains text, the information transferred is not text but a picture of text. Optical character recognition(OCR) software is necessary  to read this image and convert it to actual text  data and this software  varies widely in its ability to do so. Scanners  rang from  monochrome (2 color) scanners to flatbed  scanning a whole page at once and costing  several  thousand rupees.

JOYSTICK

Joystick is an input device used for games, computer aided designs or simulations. It is like a lever that moves in all directions and controls the movement of a pointer or some  other display symbol. A joystick is similar to a mouse, except that with a mouse the cursor stops moving as soon as you stop moving the mouse. With a joystick, the pointer continues moving in the direction the joystick is pointing. To stop  the pointer, you must return the joystick ti its neutral position. Most joysticks include two buttons called triggers.