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Forge is a Modloader which means that it can load modifications (mods short) with in the game, without that this has to be changed. Meanwhile Minecraft Forge has become a standard, since it is regularly adjusted in part to new Minecraft versions and on the other not only a Modloader, but also a program interface is, (so called the developer) makes the modders to program mods much easier , Meanwhile all the mods for Forge are programmed practical.
Source: Minecraft Wiki