Programmatic advertising is the automated buying and selling of digital ad space using software and real-time data. Instead of negotiating with each website, advertisers use platforms that bid for impressions in milliseconds, targeting the right audience across websites, apps, video and connected TV.
There are many programmatic platforms, and choosing one can take weeks of research. This guide explains how the ecosystem works and introduces the leading platforms.
How the programmatic advertising ecosystem works
| Component | Who uses it | What it does |
|---|---|---|
| Demand-side platform (DSP) | Advertisers and agencies | Buys ad impressions across many exchanges with targeting, bidding and reporting in one place. |
| Supply-side platform (SSP) | Publishers | Sells a publisher’s ad space to many buyers to maximise revenue. |
| Ad exchange | DSPs and SSPs | The marketplace where impressions are auctioned in real time. |
| Data management / customer data platform (DMP / CDP) | Advertisers | Organises audience data for targeting and measurement. |
| Ad server | Advertisers and publishers | Delivers, tracks and reports on ads. |
Ways to buy programmatically
- Real-time bidding (open auction) – impressions are auctioned to any buyer in milliseconds.
- Private marketplace (PMP) – invitation-only auctions with selected publishers.
- Preferred deals – fixed-price access to inventory before the open auction.
- Programmatic guaranteed – reserved inventory at a fixed price, bought through automated tools.
Leading demand-side platforms (DSPs)
1. Google Display & Video 360 (DV360)
Part of Google Marketing Platform; buys display, video, YouTube, audio and connected-TV inventory with Google’s data and measurement.
Best for: Large advertisers and agencies using Google’s stack
2. The Trade Desk
A leading independent DSP with omnichannel buying, strong data partnerships and its own Kokai AI.
Best for: Agencies and brands wanting an independent platform
3. Amazon DSP
Reaches audiences on and off Amazon, including Prime Video, using Amazon’s shopping signals.
Best for: E-commerce and retail brands
4. Yahoo DSP
Omnichannel DSP with Yahoo’s first-party data and identity solutions.
Best for: Brands seeking broad reach
5. StackAdapt
Self-serve DSP known for native, display, video and CTV campaigns with an easy interface.
Best for: Mid-sized advertisers and agencies
6. Criteo
Commerce media and retargeting platform working with retailers’ data.
Best for: Retail and e-commerce retargeting
7. Adobe Advertising (DSP)
Part of Adobe Experience Cloud, with deep integration with Adobe Analytics.
Best for: Enterprises already on Adobe
8. AdRoll
Easy retargeting and display platform for small and mid-sized businesses.
Best for: SMBs starting with retargeting
Leading supply-side platforms (SSPs) for publishers
- Google Ad Manager – ad server and exchange for publishers of all sizes.
- Magnite – one of the largest independent sell-side platforms, strong in CTV.
- PubMatic – a global SSP founded by Indian entrepreneurs.
- Index Exchange and OpenX – independent exchanges for web and app inventory.
- InMobi – Indian-origin mobile advertising platform for apps.
How to choose a programmatic platform
- Minimum spend and whether it is self-serve or managed service.
- Channels available — display, video, CTV, audio, native, mobile apps.
- Targeting and data options, including first-party data and contextual targeting.
- Brand safety and fraud prevention tools.
- Transparency of fees and reporting.
- Support and training for your team.
Frequently asked questions
What is programmatic advertising in simple words?
It is buying digital ads automatically through software that bids for ad space in real time, targeting specific audiences across many websites and apps.
What is the difference between a DSP and an SSP?
A DSP is used by advertisers to buy ads; an SSP is used by publishers to sell their ad space. They meet in ad exchanges.
Is programmatic advertising suitable for small businesses?
Self-serve platforms like AdRoll, StackAdapt and Google Display campaigns make it accessible, but most DSPs have minimum budgets.
Is Google Ads programmatic?
Google Display Network and YouTube campaigns use automated, auction-based buying; DV360 is Google’s full programmatic DSP for larger advertisers.
