A technology platform that provides centralized and aggregated media buying from multiple sources including ad exchanges, ad networks and sell side platforms, often leveraging real time bidding capabilities of these sources. DSPs allow advertisers to buy impressions across a range of publisher sites, but targeted to specific users based on information including location and previous browsing behaviour. Publishers make ad impressions available through marketplaces called ad exchanges and DSPs automatically decide which impressions make the most sense for an advertiser to buy. Price is often determined by a real-time auction through a process known as real time bidding.