Basics · also called programmatic, programmatic buying
Programmatic advertising
Programmatic advertising is buying and selling ad space through automated software, usually one impression at a time, instead of through manual negotiations, phone calls and paper contracts.
Programmatic advertising means machines do the buying and selling. Instead of a salesperson agreeing a price with a media buyer by email, software on both sides decides in milliseconds whether a particular ad slot, shown to a particular person, is worth buying and at what price.
The best-known form is real-time bidding in an open auction, where an SSP sends a bid request to many DSPs and the highest bidder wins. But programmatic also includes fixed-price and reserved deals run through the same pipes, such as private marketplaces, preferred deals and programmatic guaranteed.
A common confusion is that programmatic equals "cheap leftover inventory". Today premium publishers, CTV apps, DOOH screens and programmatic audio all trade programmatically. The trade-off is scale and precision versus complexity: more automation means more intermediaries and more room for ad fraud and opaque fees, which is why tools like ads.txt, sellers.json and supply path optimization exist.
Think of it like this
Traditional ad buying is haggling at a market stall; programmatic is a stock exchange where orders are matched automatically in a fraction of a second.
An example
A running-shoe brand in Brazil sets a rule in its DSP: bid up to US$4 CPM for sports-news readers in Sao Paulo on mobile. Over a week the software bids on 20 million opportunities and wins 3 million of them without a single human negotiation.
Related terms
Real-time bidding (RTB)
Real-time bidding (RTB) is an automated auction in which advertisers bid on a single ad impression in the fraction of a second while a web page, app or stream is loading.
DSP (demand-side platform)
A DSP (demand-side platform) is software that advertisers and agencies use to buy ad impressions automatically across many exchanges and publishers, deciding which impressions to bid on and how much.
SSP (supply-side platform)
An SSP (supply-side platform) is software that publishers use to sell their ad inventory automatically to many buyers, running auctions and managing prices, deals and quality controls.
Open auction
An open auction is a real-time programmatic auction in which any approved buyer connected to an exchange can bid on a publisher's impressions, without a pre-arranged deal.
Direct-sold advertising
Direct-sold advertising is ad space sold by a publisher straight to an advertiser or agency through a negotiated deal, usually with a fixed price and guaranteed volume.
Sources: IAB Tech Lab: OpenRTB