Slot machines have been one of the most popular gambling games in casinos since long time ago. It is probably because this game does not require a lot of skill in order to be able to play. If you are interested in playing online slots, you need to be aware when choosing the gaming site. You might see that many online casinos offer a 98% payout rate. Remember that not all machines have that rate. The number might just be the average of all the slots in that online casino. Find a sign over the machine to have the one that actually provide that exact rate.