Forge is a mod loader that allows users to add mods to Minecraft. By itself, Forge will not change the appearance or game play of Minecraft. Its purpose is to provide an interface for mod designers to add their mods to the base game.
Minecraft has a large community of designers who create modifications (“mods”) to the game. These modifications can change the appearance of the game by improving graphics and adding features to the user interface. Adding Mods can also change the way the game is played, such as with new items and challenges. The Forge mod allows Minecraft players to modify their own version of the game.