The User Interface, or UI, is a part of a game or program that the user interacts with. The term generally refers specifically to the buttons, windows, and other controls a player sees and uses.
In many games, the developers make allowances for players to craft their own unique look-and-feel for their own UI. The player can modify ("mod") just their own client application, or one can upload one's UI mod to one of the many fansites that host file transfers. Players can also download mods by peers and use those UI mods with their client. In World of Warcraft, these mods are called AddOns.
By swapping out UI mods, the entire gaming community has the opportunity to find a UI that works for their playing style.
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