The role of the umpire is to keep the score. He is the main official which means that he keeps score of the match, makes sure that the players are performing legal shots and that there serves are correct. There are many linesmen placed strategically around the court to decide whether a shot landed in or out.
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Well the umpire is there to keep the fights from breaking out like in the finals of 1942 in Saskatchewan. They keep an eye on the birdie to see whether it is in or out of bounds. They also catch the players rackets when they throw them to get the birdie when it is too far away.
the answer is... it takes over the referees place and when the match is over, he tells the referee to stop the match.