The Proleague format is a way a team league or tournament can be played. The difference to the All-Kill Format is that the map lineup is announced to the teams who then pick players for each map. Both teams then announce their player lineup which completes the match lineup. The players will then face each other on their map of the map pool. The maps and players are predefined for all games, except the players of the ace match if required.
Each set is played as a best of one between the chosen players. The winner gains a point for his team. This goes on, until the victor is determined. Usually the Proleague format is played as a best of 7. That means the first team achieving 4 victories is the winner of the match.
Perhaps the highest profile instance of this format is the Starcraft Proleague.