World champion refers to the title of the first place in a competition, which is a world championship sponsored by a single sports organization. The first place in the World Cup and the Olympic Games are not real world champions: the former is the "World Cup champion" and the latter is the "Olympic champion".
"World Champion" is also the highest standard professional promotion event in the glory of the king. That is, the Summer Champions Cup and the Winter Champions Cup. The competition is divided into three parts: trials, group matches and elimination matches.