The Royal Rumble is a yearly professional wrestling pay-per-view event, aired every January by World Wrestling Entertainment (WWE). The show's main event is a Battle Royal-type match, named the Royal Rumble match. The pay-per-view is part of WWE's "Big Four", along with WrestleMania, SummerSlam, and Survivor Series. The Royal Rumble is also one of WWE's more popular pay-per-views.