DPI, or dots per inch, is the measure of a computer mouse’s sensitivity. The higher your DPI, the farther your on-screen cursor will move for every inch your move the mouse.
This is why many people choose to change the DPI on their computer mouse. Lowering the DPI can help with tasks that require precision, like drawing with a mouse; raising the DPI is ideal if you need faster movement for games or other apps.
More advanced mice often have sliders or buttons that allow you to adjust the DPI in the mouse itself. Some have dedicated computer apps that will let you do it too.
However, if your mouse has neither of these things, you can still artificially adjust the DPI using your computer’s settings menus. Just note that while using this method is safe, it can make your cursor seem buggy or less accurate. This is especially true if you try to make a slow mouse go much faster.