Knowledge Base > Topic Categories > Delivery Engine > What are Guaranteed and Non-Guaranteed impressions?
What are Guaranteed and Non-Guaranteed impressions?
by Aaron DelloIacono Thies
In AHS, a campaign's impressions are defined as either "Guaranteed" or "Non-Guaranteed". All campaigns which have a defined start date, end date and impression goal are classified by the delivery engine as Guaranteed, meaning they have pre-determined daily delivery impression goals. Campaigns which have no impression goal are classified as Non-Guaranteed. Guaranteed campaigns will always take priority over Non-Guaranteed campaigns when the delivery engine is making its delivery decision.