PVP stands for Player versus player, and it allows you to interact with other players (Mabinogi Gold) inside a battle system. Thus, allowing you to be able to fight other players with ordinary skills, like you would to a monster.
There is only one PVP arena open right now, and that is the Alby Dungeon Arena. You can get into the arena by buying Alby Arena Coins from Ranald in Tir Chonaill. Ranald is near the school in Tir Chonaill. Than you would head down towards the Alby Dungeon, and when you arrive at the dungeon make sure that you only drop one arena coin onto the Alby dungeon alter. We provide Mabinogi online gold for you.
Once you are inside the dungeon, you are still not completely yet inside the arena yet. If you enter the next room of the statue of goddess, you will see little fairies, behind the rock. It doesn't look like a statue, but it looks like a stone in Mabinogi. You will need to spend 5 gold into actual PVP arena.