The most famous variant of poker is, of course, texas hold ‘em, and it's the game you see the most in all the casinos and tournaments around the world.
however, There are other variations on poker, and omaha is one of them.
the Difference between texas hold'em and omaha is that when you are dealt two cards at the beginning of each round in hold’em, you get four cards in omaha poker.
This means, therefore, that the chances of getting a better card combinations in the table are considerably higher, than what they are in texas hold’em.
You can play omaha and texas hold'em in most of the online casinos that are available, because they are so well-known variations of poker.
A good casino where one can test themselves on their luck in omaha is the betsson casino.