Ad Inventory
Ad Inventory refers to the total number of ad spaces a publisher has available for sale across their websites or apps. Each time a page loads, those slots become potential impressions that advertisers can bid on.
For publishers, effectively managing inventory through yield optimization tools and header bidding can dramatically increase eCPM (effective cost per thousand impressions). For example, a premium news site might sell its homepage banners directly to advertisers, while remnant inventory is sold programmatically via an SSP to fill every available impression.
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