A trackball is a pointing device that consists of a large ball housed in a stationary base. Users control the cursor on a screen by rotating the ball with their fingers or palm. This design allows for precise movements without needing to move the entire device, making it a popular choice for graphic designers and gamers. Trackballs can be more ergonomic than traditional mice, as they reduce wrist strain by allowing users to keep their hands in a more natural position. They come in various sizes and styles, often featuring additional buttons for shortcuts, similar to those found on a computer mouse.