Hacking may refer to: Computer hacking, including the following types of activity: Hacker (programmer subculture), activity within the computer programmer subculture Hacker (computer security), to access computer networks, legally or otherwise Computer crime Phone hacking, the practice of intercepting telephone calls or voicemail messages without the consent of the phone's owner Illegal taxicab operation Pleasure riding, horseback riding for purely recreational purposes Shin-kicking, an English martial art The act of stealing jokes Hacking, an area within Hietzing, a municipal district of Vienna, Austria Roof and tunnel hacking, a type of urban exploration c99 shell, r57 shell