WWE Extreme Rules (simply known as Extreme Rules) is a professional wrestling event produced annually by WWE, a Connecticut-based promotion, and broadcast live and available only through pay-per-view (PPV).
The name of the event stems most matches being contested under hardcore wrestling regulations;the defunct Extreme Championship Wrestling (ECW) promotion originally used the term to describe the regulations for all of its matches.
The event name was established in 2009, however its theme began with its predecessor, One Night Stand, which was promoted in 2005 and 2006 as an ECW reunion show. In 2007, WWE promoted the show as one of its own regular PPV events but kept the ECW concept of Extreme Rules matches. In 2009, WWE renamed the One Night Stand event to WWE Extreme Rules.