DPI is a reference to ‘dots per inch. The DPI measures the dot density of an image or video and indicates the resolution of the content. Typically it is the measurement of the number of dots per 1 inch. It is used to measure the resolution quality of a digital scan or preview document in most cases.  For a mouse, DPI means the speed at which your cursor will move. Higher the DPI, the faster the movement. This suggests that a faster cursor will reduce the movement of your hand. Thus it is beneficial for people who spend long hours working on their laptops and computers. Gamers use high DPI mouses to maintain precision and stiffness in movement during their games.