Why are there two umpires on the field?

Why are there two umpires on the field?

There are two umpires in the field – one standing at the bowler’s end and the other at the striker’s end, who is known as the ‘square leg umpire’. The umpire at the bowler’s end stands behind the stumps as it is the best position to judge lbw appeals. The other umpire stands in the position of a shortish square leg, but as the law states, he may elect to stand on the off instead of the leg side. In cases of stumping, hit wicket, or run-outs at the striker’s wicket, the square leg umpire’s decision is final. Appeals by the fielding side are taken care of by the umpire at the bowler’s end. At the end of each over, the umpire at the bowler’s end moves out to square leg at the same end, and the other umpire moves in to the wicket to become the ‘main’ umpire.