Programmatic advertising is the buying and selling of ad space through software and real-time auctions, instead of human negotiation. Tools like Criteo, RTB House, and AdRoll are all built on top of this system — before comparing them one by one, it helps to understand how the underlying mechanism works.
Three Sides: DSP, SSP, Ad Exchange
- DSP (Demand-Side Platform): The software on the advertiser’s side. Audience, budget, and bid strategy are defined here; the moment a user lands on a site, the DSP automatically bids for the ad slot that fits that user.
- SSP (Supply-Side Platform): The software on the publisher’s (site owner’s) side. It puts the site’s ad slots up for sale and accepts the highest incoming bid.
- Ad Exchange: The auction marketplace where DSPs and SSPs meet. The instant a user opens a page, an auction runs for that page’s ad slot in milliseconds — this is called real-time bidding (RTB).
When a user lands on a news site, the DSP with the highest bid among dozens competing in that instant’s auction wins and shows its ad — the whole process finishes before the page is done loading.
Why This Is a Separate Category From Google Ads / Meta Ads
Google Ads and Meta Ads are technically DSPs too, but they operate in closed ecosystems — they can only reach slots within their own networks (Google Display Network, Instagram/Facebook). Independent DSPs (Criteo, RTB House, AdRoll, and similar) instead give access to thousands of different publisher sites across the open web, from a single interface. That means broader reach, but also less control over brand safety and exactly where an ad appears, compared to Google/Meta.
Where Native Advertising Fits In
Native advertising isn’t a subset of programmatic — it’s a format choice. A classic banner ad visually stands apart from page content, while a native ad renders to match the page’s design (for example, appearing like a headline in a “recommended content” section). Networks like Taboola and Outbrain specialize specifically in this format; they use the same RTB mechanism, but the ad’s visual presentation differs.
Pricing Logic
CPM (cost per thousand impressions) is the most common pricing model in programmatic advertising, because the auction runs on an impression basis. Some networks also offer guaranteed CPC (per click) or CPA (per action) models, but in that case the network takes on the risk of optimizing its own CPM auction toward that outcome internally.
Who It Fits
Programmatic/native networks tend to be worthwhile when:
- The Google/Meta remarketing audience has become saturated and additional reach is needed
- An e-commerce site wants dynamic product ads (banners that remind users of items they viewed)
- The goal is brand awareness on content/news site traffic using a native format
For small-budget accounts, these networks’ minimum spend thresholds and setup complexity may not justify the return compared to Google’s or Meta’s own remarketing tools.