This article breaks down each component of that archive and its role in server operation.
: These files represent the basic terrain height and water data for the entire world. Without these, the server wouldn't know where the ground is, leading to players and NPCs falling through the world. WoW-WOLK-3.3.5a-Server-DBC-Maps-MMaps-VMaps-Wor...
Data used for NPC pathfinding, preventing creatures from walking through walls or getting stuck. VMaps (Visibility Maps): This article breaks down each component of that