Brazilian Jiu Jitsu is a groundfighting art. Jiu-Jitsu originates from Japan but the Brazilian form was modified through street fights. Brazilian Jujitsu practitioners prefer going to the ground as opposed to standing and going down as a last resort. Brazilian Jiu Jitsu practitioners are comfortable while on their backs. A primary skill to learn is to pass someone’s guard. This essentially means to get someone’s legs from around you and position yourself on their side (side control) so you can lock or choke someone at will.   The two main styles of Brazilian Jiu-Jitsu are contributed to the Gracie and Machado clans in Brazil. For more information on check out this link