Put in the right hands, emulators can successfully help the programmers to perform foreign games translations, bug fixes found in original games or updates of rosters in older games.
While their use can be illegal, emulators are not meant to encourage piracy. This way, you can enjoy games that normally don't run on other systems but the ones they are developed for.
Console emulators bring the features of video game console such as PlayStation, Xbox, Sega or Nintendo to your PC.