A rack is a device that is specially designed to hold a suitcase. The device can be a folding style model that is designed for business travelers, or a rack can be permanently attached to a wall in a home, hotel or motel. Racks are made of a number of different materials, but they are usually made of metal or steel. These materials are ideal for racks because they are strong enough to hold a large suitcase. A concrete example of a rack is often encountered as a permanent fixture in most hotel rooms. Say you are traveling and stop at your favorite luxury hotel. After you have finished the check-in process, you proceed to your room. You quickly look around for a place to put your suitcase, so you can start unpacking. There, along the wall is a rack that is designed just for your needs.