What is an Exploit?

In the realm of online games, an exploit is usually a software bug, hack or bot that contributes to the user's prosperity in a manner not intended by the developers.
What is or is not considered an exploit varies between games and developers. The EULA (End-User License Agreement) typically states what type of gameplay is not acceptable. Thus, some developers may consider AFK gameplay to be an exploit, while others may not.
Known types of exploits in World of Warcraft
Speed Hacking/Teleporting/Subterrain Travel - If character position in age of conan is determined by the client side (usually not the case), it is possible for players to send out artificial positional data and be instantly transported to any part of the world or used to speed up traveling speed by increasing positional deltas.
Holes - Some games may contain accidental holes in the map, allowing the player to get under the map. Holes are mostly harmless, although some use them in player vs. player situations to sneak around and get behind their opponent.
Botting - A player who runs a third party program to control their character. The bot will kill monsters, loot money, mine ore, collect herbs or gain levels automatically without the player having to be in front of the computer.
Duping - Duplicating, or replicating items or money.
Game Mechanics Exploits / Bug Exploits - There are also other exploits involving the physics of the game, sometimes in conjunction with items. This includes using wall-walking to get into unfinished areas or abilities to make one's character unattackable by mobs or other players and sometimes are able to attack back.
Data Mining - This is typically most common around the time that a patch is released on the public test realm of World of Warcraft. Players will try to access files not yet in game and then host them on websites to expose content not yet released (usually new zones, items, and graphics).
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