Question

2) What do you mean by Track ball?
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Answer 1

Answer:

a small ball

Explanation:

it it is set in holder and can be rotated by hands to move acursor on a computer screen

Answer 2

A trackball is an input device used to enter motion data into computers or other electronic devices. 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.