There are basically 2 types of slot machines. They are straight and progressive slot machines.

Straight slot machines are those which have the payout schedules stick on them. These schedules clearly states as to how many coins one can win by playing with specific coins. For example, a payout schedule may inform like if you have deposited 1 coin, then you would have 100 coins, if you have deposited 2 coins, you would have won 200 coins, if you have deposited 3 coins, you would have won 400 coins and so on.

Progressive slot machines are machines which differ in the way they display the payout schedules. In this type of machine, the payout is given in terms like, if you get a specific pattern of winning combination, then you win 100 coins. Thus, it speaks about the type of symbols you get to win certain number of coins rather than the number of coins to be used to get the prize. Another feature of this machine is the progressive jackpot. These machines are connected in a network and a part of each coin deposited into the machine is taken to form a progressive jackpot. This is a very huge amount as it keeps progressing until anyone hits a jackpot. One has to play the maximum coins to get a progressive jackpot.