Out-of-home (OOH) advertising, also called outdoor advertising, outdoor media, and out-of-home media, is advertising experienced outside of the home. This includes billboards, wallscapes, and posters seen while "on the go;" it also includes place-based media seen in places such as convenience stores, medical centers, salons, and other brick-and-mortar venues.
OOH advertising formats fall into six main categories: billboards, street, roads, highways, transit, and alternative.
The OOH advertising industry in the United States 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. Currently, the United Kingdom and France are Western Europe's first and second largest markets for OOH, respectively. Data from Outsmart (formerly the Outdoor Media Centre), the UK's out-of-home advertising trade association, shows that digital out-of-home (DOOH) grew at a 29.7% CAGR from 2009 to 2014.