A split pot in poker is when two or more players have the same five-card hand, which results in them splitting the pot. This poker term can also be used in hi/lo games, in which the pot is split between the high hand and the low hand.
Split Pot Poker Example:
You have reached the showdown with a Qc 7c hand, while the two other remaining players have Qh Th and Qs 2c hands. The board reads Ac Kd Js Td. All three of you have invested the same amount into the pot. As all of you have a straight, the pot is split into three equal amounts.