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Ans:These are the devices that are used for control of the cursor. They allow the position of control on the computer and the functions of the software to be executed. Example: mouse, trackball, light pen etc. Mouse:- It is a pointing device having a small box with a round ball on the bottom and three buttons on the top. The mouse is attached on the terminal by cables. It allows the user to manipulate the cursor on the screen. The mouse captures the cursor and the movements of mouse control the operations on the computer. Mouse could be optical, offering quite and reliable operation, or mechanical which is cheaper but noisier. User can move the mouse, stop it at a point where the pointer is to be located and with the help of buttons, make selection of choices.