Outdoor advertising, frequently known as out-of-home advertising, or OOH, is advertising that targets people when they are outside their homes. This could be through a wide range of mediums, such as billboards, transport like taxis and buses, and just about anything you can whack a banner on, such as bus stops and even lamppost banners. However, as catchall as this sounds, it actually excludes adverts viewed on a mobile phone or other personal devices (even if they're seen outside of the home)!   But if you wanted the shorter version, our definitive OOH definition would be: Out-of-home (OOH) Marketing refers to advertising media displayed in public spaces outside of a consumer's home.Watch our short explanation videos:How Outdoor Advertising WorksHow Outdoor Media Works In 2038New Billboard Day - The Simpsons