If you have ever been to Las Vegas you will known that casino slots are simply everywhere and they are played day and night more or less continuously but because of this the payout percentage of those casino slots is far greater than the ones you may find in your club or local bar and the same applies to online slots. Slots at online casinos will nearly always have a higher percentage payout than anywhere else and they rely on income from the frequency of use. Every online casino carries a large choice of casino slots but they can still be broken down into two major sections namely 3 reel slots and 5 reel slots and in fact some online casinos actually categorize them as such. The three reel slots have fewer winning possible combinations and therefore have fewer winning lines whereas the 5 reel slots have more winning lines available but of course you always have the choice of how many winning lines you play for each spin. The progressive jackpots slots are always 5 reel slots but you do not have to be betting on all winning lines to hit the jackpot but chances are you will need to be betting the maximum amount per line allowed to win the really large jackpots. The advantage of casino slots is that there is no skill involved and in fact it is not even necessary to understand what is going on anymore as the machine electronics will award you with any wins you have. That said casinos.ie firmly believes that part of the excitement and adrenalin is understanding what makes winning lines and what triggers free spins or jackpots. Every slot at an online casino will have a pay table or similar that you can click on where an explanation of wins is given.