trackball

A trackball isn't like the mouse most of us are used to; you don't move the whole device around. Instead, it has a visible ball set in a socket. You roll the ball with your fingers or thumb to move the cursor on the screen. You can think of it as a kind of upside-down mouse. It was more common before optical mice became standard, but it is still used today for tasks like CAD work or in places where space is limited, such as some industrial settings. Some people also prefer it because it needs less desk space and can feel more comfortable during long periods of use.

The trackball, as the name suggests, centers around a ball. Unlike a traditional computer mouse, which you move across a surface, a trackball stays in one place. You control on-screen movement by turning a ball with your fingers, thumb, or sometimes the palm of your hand. Rolling the ball moves the cursor, and faster movement usually makes the cursor move faster as well.

Trackballs emerged as an alternative pointing device in the early days of computing, offering a different ergonomic experience. Although optical mice later became the standard choice for most people, trackballs did not disappear. They are still favored by some designers, engineers, and other users who like their precision and control, especially when working with software such as CAD (Computer-Aided Design).

You might also find them in places where a regular mouse is not practical, such as kiosks, medical equipment, or industrial control panels. Because the device itself does not move, it takes up less desk space and can be easier to use in tight areas. There are even versions designed for one-handed use, which can also help with accessibility.

So, while you might not see a trackball on every desk these days, this sphere-based pointing device still serves a useful purpose, giving people another way to navigate a computer with precision and control.