Yes, it is a standard and often legal requirement for hotels to ask for a valid, government-issued photo ID from all adult guests at the time of check-in. In the United States, a driver's license or passport is typically sufficient. Internationally, however, regulations are often stricter; many countries in Europe, Asia, and the Middle East require hotels to take a scan or photocopy of your passport to comply with local police registration laws. This is used to verify the identity of the person who made the reservation and to prevent fraud. If you are traveling as a group, most hotels will require the ID of the "primary guest" on the booking, though some regions require every adult in the room to present identification. Furthermore, you will almost always be asked to provide a credit card for an incidental deposit (to cover room service, mini-bar, or damages) that matches the name on your ID. Failure to provide a valid ID will almost certainly result in the hotel refusing to honor your reservation.