In the video game Minecraft, mods refer to community-made modifications to the popular sandbox game which can be downloaded from the Internet and used. Minecraft mods can add additional content to the game, tweak specific features, and optimize performance. Thousands of mods for the game have been created, with some mods generating an income for their authors. While Mojang Studios does not provide an API for modding, community tools exist to help developers create and distribute mods. The popularity of Minecraft mods has been credited for helping Minecraft become one of the best-selling video games of all time.