When free spins are given to players by online casinos as a bonus promotion, players are generally given a fixed amount of spins on a single slot machine with a predefined wager setup.

Players are playing without risking their own money and normally win prizes that are added to their casino bonus account.

When the free spins are played, the promotion is completed and players are free to wager their bonus credits on any games at the online casino.
Once the casino bonus wager requirement has been met, players can withdraw their winnings.

The most popular slot machine bonus feature at online casinos is the Free Spin feature. There are houndreds of different free spin variants, but the typical version is awarded when three scatter symbols appear randomly on the game reels.

When the free spin bonus feature is played, the slot machine spins without consuming any of the players credits.

Many free spin bonus features offer players increased payouts during the bonus feature with prize multipliers or offer players increased chances of winning with extra wild symbols or special bonus features such as expanding wild symbols and chances to win additional free spins.