Google last month launched the Guaranteed Packages in DV360. Guaranteed Packages are open exchange deals, with a guaranteed CPM, that automate the sourcing and matching of inventory in DV360. Only inventory from the Google Ad Manager is available. Advertisers requesting a Guaranteed Packages can choose certain publishers, audiences, and campaign

The 4 ways publishers are selling their inventory to buyers: IO, Programmatic Guaranteed, Open Auction and PMPs.