AppNexus

AppNexus is a programmatic advertising platform that provides technology infrastructure for buying and selling digital advertising inventory. It operates as both a supply-side platform (SSP) for publishers and a demand-side platform (DSP) for advertisers, facilitating real-time bidding auctions. AppNexus was acquired by AT&T in 2018 and rebranded as Xandr, though the AppNexus technology and brand remain in use within the advertising ecosystem. The platform supports display, video, mobile, and native advertising formats across web and app environments. AppNexus provides advanced targeting capabilities, fraud detection, viewability measurement, and yield optimization tools. It integrates with major ad exchanges, data management platforms, and verification services to provide comprehensive programmatic advertising capabilities. The platform is used by agencies, brands, publishers, and ad tech companies managing large-scale digital advertising operations.