<human>:  Why is Brazilian Jiu-jitsu called Jiu-jitsu?
<bot>: Jiu-jitsu is the Japanese word for the art of “gentle art”. Jiu-jitsu is a martial art that focuses on grappling and ground fighting. It is a style of Brazilian jiu-jitsu that focuses on throws and joint locks. It was developed by the Gracie family in the early 20th century.