What's the difference between mouse CPI and DPI and why should I care?

[Windows Central]

DPI and CPI?
Shopping around for a mouse will often land you on product pages that list a specification in Counts Per Inch (CPI) or Dots Per Inch (DPI). The latter — unsurprisingly — covers how many dots are in an inch and can be used in printing as well as mice, while the former specifically relates how many virtual pixels the mouse sensor can pick up with the onboard sensor. In short, these two terms essentially cover the same specification of a mouse and can be used interchangeably.
But just because they both virtually mean the same thing in this context, which is the correct term to use?

Full story from the WindowsCentral blog...