Free spins are considered as the casino currency that you can use for specific games. This can mean as an additional feature with these games or as part of the bonus, which is integrated as part of a promotion. Often, these types of free players are offered for new players, but that's not the only case. Many online casinos also offer their regular customers free games for slots. The only important aspect to which you need to be careful is, how high the terms of sales that tell you exactly when you will be able to withdraw your profits.