Seppuku is a form of Japanese ritual suicide by disembowelment. Seppuku was originally reserved only for samurai. Part of the samurai honor code, seppuku was used voluntarily by samurai to die with honor rather than fall into the hands of their enemies, as a form of capital punishment for samurai who have committed serious offenses, and for reasons that shamed them. Seppuku is performed by plunging a sword into the abdomen and moving the sword left to right in a slicing motion. The practice of committing seppuku at the death of one's master, known as oibara or tsuifuku follows a similar ritual.