The Olympic Games (, JO), is a major international event featuring summer and winter sports, in which thousands of athletes participate in a variety of competitions. The Olympic Games are considered to be the world's foremost sports competition and more than 200 nations participate. The Games are currently held biennially, with Summer and Winter Olympic Games alternating, meaning they occur every four years within their respective seasonal games. Originally, the ancient Olympic Games were held in Olympia, Greece, from the 8th century BC to the 4th century AD. Baron Pierre de Coubertin founded the International Olympic Committee (IOC) in 1894. The IOC has since become the governing body of the Olympic Movement, whose structure and actions are defined by the Olympic Charter.