Normal Realms
hese 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
Pros

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.
Cons

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.

Sentence to remember: On a Normal realm, I will never be attacked by other players if I don't want to be, except if I enter an enemy capital or a Battleground.

Player vs. Player Realms
These realms are labeled PvP in the realm selection screen when you enter the game. You can play the same way you play on a Normal realm, except that PvP mode will sometimes be switched on automatically without any action on your part, allowing the other player characters from the opposite faction to attack you without warning. That is why you can think of the Player vs. Player realms as "war" realms. On Player vs. Player realms, you are in a constant state of war against the other faction.

Features
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.

Each time you enter a zone on a Player vs. Player realm, the name of the zone will appear with one of the following colors:
= Friendly (allied with your faction - Alliance or Horde)
= Enemy (hostile with your faction - Alliance or Horde)
= Contested (for both factions)