Video game emulators are software programs that allow one computer system to mimic the functions of another, enabling users to play games designed for different platforms. For example, a Nintendo game can be played on a PC using an emulator that replicates the original console's hardware and software environment. These emulators often come with features like save states, which let players save their progress at any point, and enhanced graphics options. While emulators can provide access to classic games, it's important to note that using them may involve legal considerations regarding game ROMs, which are the digital copies of the games.