While a Casino Bonus cannot be withdrawn, it can be converted to cash when you complete certain requirements. Any Casino Bonus with a Wager Requirement (e.g. 10xWR) is bound to expire, depending on its wagering period (e.g. Complete 10xWR within 7 days).
A welcome bonus is an incentive offered by online casinos to new users. It's designed to enhance their initial gaming experience and encourage them to make their first deposit. The structure of a welcome bonus can vary. Typically, it matches a certain percentage of the player's first deposit, up to a maximum amount.