In professional wrestling, a heel is a wrestler who portrays a villain, "bad guy", or "rulebreaker", and acts as an antagonist 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 any other manner of socially unacceptable behavior."

Professional wrestling is a form of athletic theater that combines mock combat with drama, under the premise that the performers are competitive wrestlers. Although it entails elements of sports wrestling and martial arts, including genuine displays of athleticism and physicality before a live audience, professional wrestling is distinguished by its scripted outcomes and emphasis on entertainment and showmanship. The staged nature of matches is an open secret, with both wrestlers and spectators nonetheless maintaining the pretense that performances are bona fide competitions; this is likened to the suspension of disbelief employed when engaging with fiction.