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Publink
Supply

Supply

The sell side: publishers and the placements they bring to market.

In an ad server, supply is everything that generates requests. It is organised by publisher, then by placement. Rules run on the supply side before any demand is asked.

SupplyPublisherPlacementsRequestsrules run here firstDemandoRTBVASTDirectasked after the rules
Supply is everything that generates requests. Demand is everything that can answer them.