An underground fight club refers to a secretive, unlicensed and often illegal venue where people engage in fights or combat sports. These clubs operate outside of mainstream society and are typically organized by an informal group or network of individuals who arrange matches between willing participants for entertainment purposes or as a means of settling disputes. The events that take place within these fight clubs can range from bare-knuckle boxing to mixed martial arts, with varying levels of safety precautions and rules in place. Due to the clandestine nature of underground fight clubs, they are often associated with a degree of danger or risk, as well as an element of excitement or intrigue among those who participate or attend them.