Question

what is a trackball how does it differ from mouse and joystick

Answer 1

Difference between Trackball andMouse is that trackball is a stationary pointing device with a ball on its top or side. To move the pointer using atrackball, you rotate the ball with your thumb, fingers, or the palm of your hand. ... With a mouse, users control the movement of the pointer...

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it is question of computer science...
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Answer 2

 trackball is a stationary pointing device with a ball on its top or side. To move the pointer using a trackball, you rotate the ball with your thumb, fingers, or the palm of your hand. While joystick is a handheld vertical lever mounted on a base. You move the lever in different directions and press buttons to control the actions of the simulated vehicle or player.