• You can create both Alliance and Horde characters (but they won't be able to communicate with the other faction).
• There are no "contested" zones in the game; the zones that don't belong to a faction are called "neutral" zones.
• PvP mode is activated differently than on PvP realms

• You can concentrate on epic fights, quests, and battles against monsters or non-playing characters without worrying about being attacked by other players.
• You can try to be friendly with the other faction and need not fear being attacked.

• You gain PvP rewards less easily because it is harder to get other players to fight you (except when you are in Battlegrounds).
• It's harder to have one vs. one fights that show your duel skills.

You can create only Alliance or only Horde characters on a Player vs. Player realm.
Some game policies are specific to Player vs. Player realms. You should read them before playing on a PvP realm.
Each zone of the game has a PvP flag color that shows its PvP status. There are no "neutral" zones.
PvP mode is activated differently than on Normal realms.