DOOH stands for Digital Out-Of-Home advertising. It refers to a type of “out-of-home” (OOH) advertising – that is, ads that are marketed to consumers when they are “on the go”, such as in transit, in commercial locations, or in waiting areas. Traditionally, out-of-home advertising formats fall into four primary categories – billboards, street furniture, transit and alternative.

Digital Out-Of-Home Advertising or “Digital Signage” is an emerging area of the advertising industry, having grown to $2.9 billion in 2015 according to eMarketer. Out-of-home advertising is moving steadily towards digital dynamic media, with more frequent implementation in roadside billboards, cafes, bars, shopping centers, public spaces, and so on.