What are the Omaha low hand rules and how do they differ from other poker games?

In Omaha Hi-Lo Poker, players must use two of their hole cards and three community cards to make the best low hand. The low hand must have five cards with a value of 8 or lower, with straights and flushes not counting against the low. This differs from other poker games like Texas Hold'em, where the low hand is not a factor in determining the winner.