What is hotel pre-authorization and what is its use?

The pre-authorization of the hotel means that you join the club. Besides the room rate, there may be other expenses, such as mini-bar, catering and so on. Then the hotel will use your credit card to get authorization. In fact, pre-authorization is deposit, and the result is the amount of pre-authorization. The hotel will apply to the bank for a freeze. If you spend money when you check out, but it doesn't reach the authorized amount, the hotel will revoke your pre-authorization and then use your card directly. If you reach the consumption amount, then you have completed the pre-authorization, and the pre-authorization will turn your pre-authorization into actual consumption.