What is sharding in wow?

Sharding in WoW refers to a process by which the game divides players into smaller groups, allowing for smoother gameplay and reducing server strain. It is used primarily in heavily populated areas such as major cities or during large-scale events. The system creates separate instances of a zone, with each instance being able to support a limited number of players. Players can still interact with those in their group, but may not see or interact with players in other instances. This allows for a more responsive and stable gameplay experience, as well as reducing latency and allowing for more players to enjoy the game simultaneously. The use of sharding has been somewhat controversial among some WoW players, particularly those who prefer a more consistent and immersive game world.