Princess Cruises is a Carnival Corportation & plc owned cruise line that is headquartered out of Santa Clarita, California. As of early 2020, they have 18 ships cruising the seas.
Princess Cruise Line Points (PCL Points) can only be earned if you have the Princess Cruises Credit Card. You cannot earn these points sailing Princess Cruise Line.
Princess Cruises has one credit card that can earn you PCL points which can be redeemed towards free or discounted cruises with Princess.