Do you need a reservation for a hotel room?

In order to get a room at a hotel is a reservation necessary?Do you need a reservation for a hotel room?
We would advise a reservationDo you need a reservation for a hotel room?
It depends on the hotel. Most hotels take walk ins also. That means people without reservations. However, if you arrive and there are no rooms you are $hit out of Luck. Reservations are the smart way to go if you can make them. I understand that it is too hard to do sometimes.
I think it depends on the place, Motels i think are more designed for walk in, customers.
Always nice to have a reservation....saves time and money.
Not all hotels, but you do have to be 21