Marriott's cancellation policy is highly dependent on the rate type and the specific hotel, but most "Standard Rates" allow for free cancellation if done 48 to 72 hours before arrival. In contrast, "Member Exclusive" or "Advance Purchase" rates are usually non-refundable and require full payment at the time of booking; if you cancel these, you will likely lose the entire amount. For reservations made using Marriott Bonvoy Points, you can typically cancel and have the points reinstated without penalty as long as you are within the hotel's standard cancellation window. Always check your confirmation email for the exact "Cancellation Deadline," as resort properties or high-demand locations may have stricter 7-day or 14-day policies. Cancellations can be managed easily via the Marriott Bonvoy app or website.