Digital Out-of-Home (DOOH) refers to advertising displayed on digitally powered screens in public spaces – roadside billboards, transit stations, airport terminals, shopping malls, gyms, and stadiums. Unlike traditional printed outdoor advertising, DOOH screens can serve multiple creatives, be updated in real time, and increasingly be bought and sold programmatically. US DOOH spend is projected to reach $1.35 billion in 2026, with programmatic DOOH growing faster than any other segment of the category.
Programmatic DOOH connects screen operators (publishers) to advertisers through DSPs and SSPs adapted for out-of-home inventory. Advertisers set targeting parameters – location, time of day, audience demographics pulled from mobile data or contextual signals – and their creative is served automatically when conditions are met. Unlike digital display, DOOH ads are served to many people simultaneously, so targeting is based on audience profiles at a location level rather than individual user tracking. Creatives can be triggered dynamically by real-world conditions: weather data, sports scores, traffic patterns, or time of day.
DOOH bridges the gap between digital precision and the reach of mass-media outdoor advertising. For advertisers, it offers a brand-safe, unskippable format at scale with more targeting flexibility than traditional OOH. For publishers and screen operators, programmatic DOOH opens their inventory to the full demand of digital buyers, increasing fill rates and CPMs beyond what direct-sold campaigns alone could deliver.