A mechanical mouse detects mouse movement using a ball on the bottom of the mouse which rolls as the mouse is moved. This type of mouse needs regular cleaning to remove dust and dirt from inside the mouse and ensure smooth motion. You should use a mouse pad to provide a smooth surface for moving the mouse and to reduce the amount of dirt that enters the mouse.

An optical mouse detects mouse movement using a beam of light. This type of mouse does not contain any moving parts that can wear out or require cleaning. You do not need to use a mouse pad when using an optical mouse, but for best results you should use the mouse on a flat surface that is a solid color.

A tablet consists of a flat surface and a pen, called a stylus. When you move the Stylus on the surface of the tablet, the mouse pointer moves on the computer screen. Tablets are most often used for performing tasks that require speed and precision, such as graphic design and image editing. Tablets, also known as digitizer tablets and graphics tablets, also often come with a mouse that you can use in addition to the stylus.