In professional wrestling, a heel (also known as a rudo in lucha libre) is a wrestler who portrays a villain, "bad guy"[1] or "rulebreaker" and acts as an antagonist[2][3][4] to the faces, who are the heroic protagonist or "good guy" characters. Not everything a heel wrestler does must be villainous: heels need only to be booed or jeered by the audience to be effective characters, although most truly successful heels embrace other aspects of their devious personalities, such as cheating to win or using foreign objects. "The role of a heel is to get 'heat,' which means spurring the crowd to obstreperous hatred, and generally involves cheating and pretty much any other manner of socially unacceptable behavior that will get the job done."[5]