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Ad inventory is a term that refers to all available ad space on a site. Sometimes, inventory and ad space are used interchangeably.
Inventory can be categorized as premium, remnant, and long-tail.
Premium Inventory: This category contains the most valuable ad inventory, typically from recognizable publishers, high-traffic pages, and highly visible areas of a webpage.
Remnant Inventory: This category includes inventory that wasn’t sold directly to advertisers through direct deals and other primary inventory-monetization channels. Remnant inventory is typically sold for less than the publisher’s standard price.
Long-Tail Inventory: This category comprises ad inventory on low-traffic sites and blogs. The main ad exchange for long-tail inventory is Google AdSense, but publishers seeking better monetization alternatives to AdSense join affiliate programs and other ad networks.