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A trackball is a computer input device that consists of a ball held in a socket, which users roll with their fingers or thumb to move a cursor on the screen. Unlike a traditional mouse, the body of the trackball remains stationary, making it a stationary pointing device. It is used for tasks that require precision or when there is limited desktop space.

Key features

Stationary design: The device itself does not move; only the ball is manipulated.

Ball rotation: The user rotates the ball to control the on-screen pointer.

Sensors: Sensors inside the socket detect the ball's rotation and translate it into cursor movement.

Advantages

Ergonomics: Can be more comfortable for long-term use because it requires less arm movement.

Space-saving: Works well in environments with limited desk space.

Precision: Provides precise control, which is beneficial for tasks like graphic design, video editing, and gaming.