PvP is and acronym of Player versus Player, also called "Hot Pirate on Pirate Pillaging Action". It is the act of fighting against other player(s) in sea battle. The frequency of PvP varies on each ocean. There are still some real PvPers out there, but traders usually try to avoid it.
As you win more PvP battles, the PvP ranking of your crew will go up. However, when you lose again, it will come down a bit. These are the ranks in ascending order:
- Mostly Harmless
- Scurvy Dogs
- Dread Pirates
- Sea Lords