"Nintendo DS emulator so you can play on your PC"
Just like all emulators, DeSmuME is used so you can play games from other platforms on your PC. In this case, it is an emulator program that lets you play Nintendo DS games on your computer. As far as emulators go, DeSmuME is limited but functional; it doesn’t allow you to do screen shots or configure your controller, for example, but it is useful for many Nintendo DS games you might want to play.
Plus, DeSmuME is compatible with all the major computer platforms, including Mac, Linux and Windows, so you can enjoy all your favorite Nintendo DS games on your computer regardless of the operating system you use.
Like many similar programs, the DeSmuME emulator was designed so that game developers could test them more conveniently and comfortably in their offices on their PCs, but ultimately it has become an emulator for ordinary people like you and me who just want to enjoy their Nintendo DS games on the computer. The program works for both games and applications, and is completely free.