In early versions, there was a horizontal line on the front of the machine which was called a payline. If you were lucky enough to land on a matching combination of symbols, you would win a prize amount. Those machines were initially invented to earn money, so they replaced the prizes with candy. Today, the slot machines use the same strategy to make money, but the payout amounts are not commensurate with the odds of winning.
If you are looking for loose slots, try to avoid casinos that aren’t active, such as airports and bars. Casinos compete with each other for customers, and they don’t usually have loose slots. While you’re playing, don’t follow advice about searching for specific symbols, as random number generators don’t take into account decorations or the size of a casino’s lobby. You can watch demos and decide if you want to try it out before spending real money.
The reason slot machines have random numbers is because they use a random number generator to randomly choose a series of symbols. It cycles through thousands of numbers per second before stopping at a particular position, corresponding to symbols on the reels. Earlier versions of the slot machines were based on simple math and could be as simple as three reels with ten symbols on each. This meant that the odds of getting any one of the symbols were one in ten million.