Modern casino slots are controlled by computer chips and software, and also the win percentages are preprogrammed into the software.

Casino slots have Random Number Generators (RNG) that are continually generating combinations, even when the machine is just not being played.

Running concurrently with the RNG of the casino slot machine will be the payout percentage.

The payout percentage controls just how much the slot machine will payout, for example the payout percentage might be 90%, meaning the slot game will payout 90% of all the bets played and the casino only gets to keep 10%.

This isn’t to claim that every time you bet 10 credits you will get 9 in return – where is the fun and excitement in that? Instead the casino slot machine game will not pay out for a while, and then suddenly go on a hot streak and you might hit a big jackpot.

So in essence the slot machine takes all of the money played into it and pays it out to few lucky winners. The casino only gets to keep a relatively small portion of all the bets placed.

The casino playing online slot software controls every a component of the machine, from the flashing lights to the spinning of the reels.

When you hit spin on the slot machine, a combination is produced by the RNG which corresponds to the images on the reel.