Omaha poker is mainly played with high hands only, but the high-low split version is also popular. Omaha High-low (aka "Omaha Hi-Lo", "Omaha hi/lo", "Omaha high/low" etc.). In Europe Omaha limit high-only is dominant. In the US, the HiLo game is gaining in popularity. Before playing, it's best to clear up the rules so as not to get confused later.
Omaha Holdem rules are based on Texas Holdem with these main differences: