Mob
From WoWWiki
A mob (short for mobile or mobile object) is a non-player entity whose primary purpose is to be killed for experience, quest objective, or loot.
The gaming term "mob" is not to be confused with its usual meaning in the English language, i.e. a large disorderly crowd or an organized gang of criminals.
Mobs are also known as bad guys, beasts, enemies, monsters, non-player attackers, and opponents. The World of Warcraft-specific term for a mob is creep which was coined by Blizzard and first used in Warcraft III. The term "mob" is in widespread use in the MMORPG genre.
Etymology
The term was originally used in Multi User Dungeons (MUDs) which were the text-based precursors to MMORPGs. In-game objects were defined either as stationary item "objects" (ranging from fountains to wearable equipment that you could pick up) or "mobs" (this included any NPC, be they aggressive monster or friendly shopkeeper, even if they were not actually moving around due to STAY_ROOM or similar flags in their properties).
In World of Warcraft, mobs differ from NPCs in that they are usually monsters that share a common name with several others rather than having a unique name or title, are non-friendly, are non-interactive, and/or exist solely for the purpose of being killed. These are part of the main aspect of PvE, and are found throughout the game world.
