The sign-up bonus you get when you register at a casino for the first time. Typically, the biggest bonus a casino gives to its players. The welcome bonus may require a deposit, may not, or could be a mix of all three types of bonuses below:
This is the majority of all bonuses. It is in addition to the money you deposit into your account so you can play more games.
The type of bonus, which does not require any deposit and is usually available right after sign-up, could be also daily/weekly.
The concrete amount of time you can spin for free in some particular game/games. Could be a deposit or no deposit required.