Out of Home advertising (or OOH advertising, OOH Media) is advertising that reaches the consumer while they are outside the home.
Out of Home advertising is focused on marketing to consumers when they are "on the go" in public places, in transit, waiting (such as in a medical office), and/or in specific commercial locations (such as in a retail venue). OOH advertising formats fall into four main categories: billboards, street furniture, transit, and alternative.
The OOH advertising industry in the USA includes more than 2,100 operators in 50 states representing the major out of home format categories. These OOH media companies range from public, multinational media corporations to small, independent, family-owned businesses.
Billboard advertising is a traditional OOH advertising format, but there has been significant growth in digital OOH (digital billboards and place-based networks) in recent years; for example, about 4,900 digital billboard displays have been installed in the United States.