A trackball is a pointing device that resembles a mouse but operates differently. It typically consists of a stationary ball that can be rotated with the fingers or palm to control the movement of the cursor on a computer screen. The trackball offers precise and accurate tracking, making it useful for tasks that require fine control, such as graphic design or gaming. Its ergonomic design allows for comfortable and efficient use, especially in situations where limited space is available. The trackball's unique functionality and versatility make it a popular alternative to traditional mice for many users.