COMPUTER FUNDAMENTALS

Detailed explanation-1: -Trackball. A trackball is a pointing device consisting of a ball housed in a socket containing sensors to detect rotation of the ball about two axis, similar to an upside-down mouse: as the user rolls the ball with a thumb, fingers, or palm the pointer on the screen will also move.

Detailed explanation-2: -The gumball-sized ball inside the mouse sits between two rollers, each of which attaches to an axle. As users drag the mouse across a smooth surface, the ball spins the rollers. vertical and horizontal rollers. This roller controls left and right cursor move-ments on-screen, which are movements along the X-axis.