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DPI stands for "Dots Per Inch," and it determines how quickly your mouse cursor moves across the screen when you move your mouse.
The higher your mouse's DPI, the faster the cursor moves, meaning you'll have to move your hand less to bring your cursor across the screen.
Different mice have different DPI counts, with gaming mice that possess counts from 6,000 to 20,000 DPI.
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You've probably had the experience of using a new computer, and realizing that the mouse cursor on-screen moves slower or faster than you're used to. It's just a mouse, a standard piece of technology — how could different mice move so differently?