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 four main categories: billboards, street furniture, transit, and alternative.