An ad work is a network of advertising sites or ad inventory that can be owned or managed by a media owner or a third party provider and is made available to advertisers, The key function of an ad network is aggregation of ad inventory and supply from media owners and matching it with advertiser demand. In out-of-home (OOH) advertising a network can be as simple as a collection of static or digital billboards from one billboard company or it may consist of a billboard network assembled from group of independent billboard owners that is made available to advertisers. Fliphound, for example, has built an ad network that aggregates hundreds of digital and LED billboards from leading independent billboard owners to create the largest public and open digital billboard network making it easier for advertisers to access and utilize outdoor advertising. On the web an ad network is a company that connects websites with advertising to sell, then aggregates that inventory for advertisers to buy, usually via programmatic exchanges.
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