DPI on a mouse stands for "dots per inch," and it measures the sensitivity of the mouse. Specifically, DPI indicates how many pixels the cursor on the screen will move when the mouse is physically moved one inch. A higher DPI means the mouse is more sensitive, causing the cursor to move farther across the screen with less physical movement of the mouse. Conversely, a lower DPI setting means the cursor moves less distance for the same mouse movement, allowing for more precise control. For example, if a mouse has a DPI of 800, moving the mouse one inch will move the cursor 800 pixels on the screen. This setting is important in applications like gaming, where having the right balance of speed and accuracy can affect performance. Gamers often prefer a lower DPI for precise aiming in slower-paced games and a higher DPI for quicker movements in fast-paced games. Most modern mice allow users to adjust the DPI to find what works best for their needs, sometimes on the fly with dedicated DPI buttons. In summary, DPI is a key factor in determining how sensitive and responsive your mouse feels in relation to your hand movement on the mousepad. High DPI means faster cursor movement, low DPI means more control and precision. This explanation is based on the sensitivity of the mouse sensor and how it translates physical movement into cursor movement on the screen. The term is widely used and sometimes interchangeable with CPI (counts per inch), but essentially they mean the same thing for mouse sensitivity.