Digital signage is actually deployed in most fast food restaurants, airports, and on highways. The major markets for digital signage are retail, entertainment, transportation, hospitality, corporate, and health care. Digital signage is usually used to lower costs, increase sales, get information or way-finding, merchandising, and to enhance the customer experience. One advantage of digital signage is that content can also be delivered in multiple ways beside a static image. The sign can be interactive with a touch screen or gesture control. Digital signage allows viewers to interact with signs in new ways such as the touch and gesture examples and through mobile devices. Digital signage is a growing force in out-of-home signage. K. Kelsen describes three major types of digital signage: point of sale, point of wait, and point of transit. Innovations in digital signage continue to emerge at a fast pace making it a must-have technology rather than a nice-to-have technology.