These realms are labeled Normal in the realm selection screen when you enter the game. The main focus of the players on those realms is to fight against the monsters in the game rather than against other players. That is why you can think of the Normal realms as "truce" realms. On Normal realms, other enemy players can't attack you unless you allow them to.
Features

• 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.