To understand the phenomenon, one must first understand the terminology. In the legitimate software world, an "installer" takes files and writes them to a hard drive. A "repack" is different. It is a customized installer that takes the original game files, compresses them significantly, strips out non-essential data (like multiplayer components in a single-player game or voiceovers in languages the user doesn't speak), and bundles them with a "crack"—a piece of software that bypasses the game’s Digital Rights Management (DRM).