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champs is basically cs major/ LoL worlds but for valorant (if thats what you are asking) the most important event of the year
Master is like seasonal international event.
Champion is the yearly international event and the most important one.
to attend Master you need to go through regional challenger, to attend Champion you need to be the team that has the most points from other team in your regional. if your points is not enough, you compete in regional Last Chance Qualifier to Champion for the last spot on Champion