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VIOOH is a programmatic digital out-of-home (DOOH) supply-side platform based in London, England. Founded in 2018, the company connects media buyers and sellers in a global marketplace for advertising. As part of the JCDecaux group, VIOOH has transformed the out-of-home advertising sector by enabling programmatic trading of digital billboard inventory. The platform offers a full-stack IT solution for automated buying and selling of digital out-of-home inventory. Key services include programmatic trading across 34 markets, a Trading Manager for media planning, and campaign activation with dynamic creative optimization and audience targeting. VIOOH supports both guaranteed and flexible programmatic buying models and integrates DOOH into multi-channel advertising campaigns alongside social media and connected TV. The company focuses on automation, transparency, and scale, providing access to premium inventory in over 30 countries.