CS:GO Ranks or skill groups, is a way of pairing you with other players when playing in competitive matchmaking. If you keep winning against the other team, the system will notice and put you in a higher skill group. The algorithms for calculating the skill group is not known though, so how exactly you rank up is unknown. Where The Global Elite contains the absolute best players in the world and Silver I is the not so experienced players. The ranking method is as before mentioned unknown. But based on experience, we can tell you a little bit of how it works.