Why do some properties show resort fees?

Depending on the city and the property you stay in, you may be charged certain mandatory hotel-specific service fees, such as resort fees (which typically apply to resort type destinations and, if applicable, may range from $10 to $40 per day). These charges, if applicable, will be payable by you to the hotel directly at checkout. When you check in, a credit card or, in the hotel's discretion, a debit card, will be required to secure these charges and any incidental fees that you may incur during your stay.
 
We make every effort to disclose resort fees prior to booking for Hot Rate and retail rate hotel purchases. These rates are updated regularly, but in rare circumstances, our information may be out of date. Please contact the hotel directly for confirmation regarding which charges apply, and with any other resort fee related questions.”