Usually, free spins are issued with a deposit or no deposit bonus and give you the opportunity to make several free spins in such well-known slot machines as Starburst, Book of Dead and many others.
You will not be able to withdraw the bonus immediately. To do this, you will need to fulfill the conditions of the wager, for example, to win back the bonus 30 or 50 times.
Be sure to pay attention to the payout percentage. If it is very low, then your chances of a successful withdrawal may be close to zero.
The only sure way to withdraw the bonus is to win a large amount in any slot and fulfill the conditions of the wager.
If you fail to win, the casino will set a limit on the maximum withdrawal of funds. Most often, a limit of 100 or less is set.
Often, free spins are also used for marketing purposes. Each spin can be played at a minimum bet (for example, € / $ 0.10).
Of course, 55 free spins sounds better than a bonus of €/$ 5.50, but in fact both bonuses have the same value.
Free spins are created and managed by game providers, so the casino itself does not have them. You can get free spins only after starting a game, such as Book of Dead.
But there is one more nuance. Bonuses will be credited to the game account only after fulfilling the wagering conditions.
Free spins can really be profitable. But remember that they should by no means be the main criterion when choosing an online casino.