A computer mouse is a pointing device that is used to navigate and interact with graphical user interfaces (GUIs) on a computer. It typically has a smooth, rounded shape and is connected to the computer via a wire or wireless connection.

The most common type of computer mouse is an optical mouse, which uses a light-emitting diode (LED) or laser to detect movement and position. As the mouse is moved, the LED or laser tracks the movement and sends the information to the computer, which then moves the cursor on the screen accordingly.

There are various types of computer mice available in the market, including wired, wireless, trackball, vertical, and gaming mice. Wired mice connect to the computer via a cable, while wireless mice connect wirelessly using Bluetooth or other wireless technology. Trackball mice have a ball on the top that is used to move the cursor, while vertical mice are designed to be held in a more natural, ergonomic position. Gaming mice typically have additional buttons and features optimised for gaming.

Overall, a computer mouse is an essential tool for navigating and interacting with a computer interface and has become a ubiquitous part of modern computing.