Google Ad Manager

Google Ad Manager (GAM) is the absolutely terrifying, unquestioned monolithic apex predator of the "Publisher Ad Serving" market. It mathematically rules the internet. It is the absolute weapon of choice for the world's largest publishers (like the New York Times) who demand a military-grade mathematical engine capable of simultaneously serving billions of direct-sold ads and dynamically auctioning unfilled inventory to the global Google Ad Exchange (AdX) in milliseconds.