Header Bidding aka Header Integration or Header Tags, is a type of popular programmatic advertising in which publishers can offer their available inventory to multiple demand partners (SSPs/Ad Exchanges), simultaneously, in real-time bidding environments, by implementing a tag directly in the header of their web page, before making the ad call to their ad server.

This allows for the publisher to earn up to 60% more revenue, load the publishers page faster and creates a better overall user experience.