Free spins promotions are either provided as part of a welcome package or as a sole welcome offer. An online casino might provide players with a match bonus and say free spins. This means that players will not only receive a match bonus but free spins on top.
Usually, free spins are provided on specific games as designated by then online. In some rare instances, free spins are allowed to be used on any slot game available at the casino the player has signed up to.
It has also been trendy in later years that casinos offer players free spins upon registration of account without any deposit required. Better known as No deposit free spins, this offer allows players to test out the casino whilst playing for free.