Minecraft Adds Official Mods This Month As A Test, Third-Party Mods Still Supported
Briefly

Mojang said fans can think of add-ons as mods in that they 'change the way that things in the game look and behave.'
Players can sideload mods from third-party sources as much as they want, provided these mods remain in compliance with the Minecraft End-User License Agreement (EULA).
Read at GameSpot
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