What is programmatic advertising?
Before programmatic, buying display ads meant calls, insertion orders, and fixed placements. Programmatic replaced that with software that buys one impression at a time, based on who's likely to see it and what it's worth to the advertiser.
It now covers display, video, connected TV, audio, and digital out-of-home. The same machinery lets advertisers buy across thousands of sites and apps from one platform.
How does programmatic advertising work?
| Part | Who uses it | What it does |
|---|---|---|
| Demand-side platform (DSP) | Advertisers and agencies | Sets audiences, budgets, and bids, and buys impressions |
| Supply-side platform (SSP) | Publishers | Offers each impression to buyers and picks the winning bid |
| Ad exchange | Both | The marketplace where bids and inventory meet |
| Data and verification | Both | Adds audience data and checks viewability, fraud, and brand safety |
| Deal type | How it's bought | Trade-off |
|---|---|---|
| Open auction | Real-time bidding against everyone | Most scale, least control |
| Private marketplace (PMP) | An invitation-only auction with chosen publishers | Better inventory, higher prices |
| Preferred deal | A fixed price, bought first if the buyer wants it | Priority without a volume commitment |
| Programmatic guaranteed | Fixed price and fixed volume, delivered automatically | Most control, least flexibility |
What is an example of programmatic advertising?
One impression, a fraction of a second
A reader opens a recipe site. As the page loads, the publisher's SSP offers the ad slot, with what it knows about the context, to several exchanges.
A kitchenware brand's DSP judges the impression worth $8 per thousand to its audience of home cooks, bids, and wins. The ad appears before the page finishes loading, and the price, placement, and outcome are logged for reporting.
Programmatic vs. direct buying
| Direct buying | Programmatic | |
|---|---|---|
| How it's bought | Negotiated orders with each publisher | Software buying impression by impression |
| Targeting | By placement and site | By audience, context, and placement |
| Scale | Limited by the deals made | Thousands of sites and apps |
| Control | High | Varies by deal type |
Why does programmatic advertising matter?
Programmatic gives advertisers reach and precision that manual buying can't match. It also adds layers between the advertiser and the publisher, each of which can take a cut or hide a problem.
- Supply path. Fees and resellers between DSP and publisher can take a meaningful share of spend, so review which paths the budget runs through.
- Quality. Check viewability, invalid traffic, and brand safety as well as cost per impression.
- Measurement. Low prices can mean low-value impressions. Judge programmatic by the incremental results it drives.
How does Alli do this?
Alli by PMG's Datasources has pre-built connectors for the major platforms, including The Trade Desk and Display & Video 360 alongside Google Ads, Meta, TikTok, Amazon, and Walmart Connect, so programmatic data lands with every other channel under the same definitions.
Alli Media Planner plans search, social, and programmatic side by side, with plans broken down by channel and vendor, and Alli Alerts watches spend with budget caps, pacing, and no-spend checks across every connected channel.
Explore Alli Media PlannerProgrammatic advertising FAQ
What is the difference between a DSP and an SSP?
A demand-side platform buys ad impressions for advertisers. A supply-side platform sells ad impressions for publishers. They meet in ad exchanges.
What is real-time bidding?
An auction for a single ad impression that happens while a page or app loads, usually within a fraction of a second. The highest eligible bid wins.
What is a private marketplace?
An invitation-only programmatic auction where a publisher offers its inventory to selected buyers, usually at a higher floor price than the open auction.
Is programmatic advertising the same as display advertising?
No. Display is an ad format. Programmatic is a way of buying, used for display, video, connected TV, audio, and digital out-of-home.
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