You probably heard the word RNG. If not, RNG or random number generator is the algorithm behind all slot machines; program that every time you hit “Spin” chooses which symbols to show. There are many myths surrounding it and many write that it can be predicted in certain way- well, that’s not true. It cannot. Still, there are certain features in online slots that can generate you an advantage.
Hitting “Spin” on land slots is like throwing a coin- it doesn’t matter what happened in 100 previous times, each time the chances are similar. Online slot machines are “smarter”. They do remember what happened before- that way the casino can shorten the periods of loosing and winning streaks and keep the payout rate closer to what its programmed, which is something they want (prevents one player from winning again and again and on the other hand, shortens the losing streaks and gives each player to win from time to time so he will keep playing).
Some might say here: “That doesn’t make sense. That way a player can sit each time till the slot machine pays and cash out and the casino will go bankrupt.” That’s not true of course. First, the casino set’s the payout below 100%, therefore in the long run, the house will keep a certain percentage of the total bets. Second, online casinos and slot machines are different. In land based casinos, only one player can play the specific slot at that time, but online, there can be dozen and even hundreds of players playing the same slot machine at the same time and although the slot would pay up, none of the players can know to whom.