A Trackball is a pointing input device. It consists of a ball held by a socket containing sensors to detect a rotation of the ball about two axes. It serves the same purpose as a mouse, but is designed with a moveable ball on the top, which can be rolled in any direction. It is like an upside-down mouse with a ball that sticks out. The user rolls the ball with the thumb, fingers or the palm of the hand to move a cursor.
The first trackball was invented by Tom Cranston and Fred Longstaff in 1952. The device was created for the Royal Canadian Navy and consisted of a Canadian bowling ball that was supported by air bearings.
Trackballs have notably low friction, as well as being made of a dense material such as glass, so they can be spun to make them coast. The Trackball’s buttons probably be situated to that of a mouse or to a unique style that suits the user. Large Trackballs are common on CAD workstations for easy precision.
A Trackball is essentially a different kind of computer mouse. It is a plastic case holding a ball on the top that moves a computer cursor around on the screen. The user can move the ball with their thumb or fingers, and sensors inside the case detect which direction the ball is moving. It’s very user friendly.