Blog
Programmatic advertising strategy and campaign management: A practical guide
Learn more
If you’re a marketer, you’re likely very familiar with . It’s the banner across the top of the news site, the product you were eyeing that finds you in the sidebar, the little rectangle between two paragraphs of a recipe. But how often do you actually look under the hood to understand how those ads get to your consumers? They certainly didn’t get there by accident—they were bought and placed by various technologies, in real time, while the page was loading after you clicked.
Programmatic display is one of the most powerful ways to get the right message in front of the right person at scale—but it can feel like a black box when you’re not familiar with the process. This guide walks through what programmatic display advertising is, how it actually works, the ad formats and sizes you’ll use, what it costs, how to target the right people and how to tell if it’s working.
Programmatic display advertising is the automated buying and selling of visual banner ads—the images, rectangles and interactive units you see on websites and apps—using software and real-time auctions.
“Display” describes the format: the actual ad that shows up in a slot on a webpage. “Programmatic” describes the method: the automated, data-driven way that ad space gets bought and sold. Put them together and you get visual ads placed by technology that decides, in milliseconds, which ad to show which person on which site.
Before we continue, it’s important to understand what programmatic display is not:
Picture an impossibly fast auction that happens every single time a webpage loads. That’s real-time bidding (RTB), the engine under most programmatic display. Here’s how programmatic display works:
All of that—the offer, the bids, the winner, the delivery—wraps up in roughly the time it takes the page to finish loading. Multiply it across billions of impressions a day and you’ve got programmatic display humming along in the background of the internet.
If you want to go deeper on the platforms that make this possible—DSPs, SSPs, ad exchanges and the rest—here’s a closer look at how programmatic works.
This section covers the three connected parts of programmatic display advertising: the platforms and ad networks that run real-time buying and selling, the inventory available through open exchanges, private marketplaces and guaranteed deals, and the placements where ads actually appear across websites and apps.
Platforms. Programmatic display is bought and sold through a set of connected platforms:
These platforms complete the full process, from ad request to auction to ad delivery, in milliseconds while a page or app loads. For a closer look at how each one works, read our guide to programmatic advertising platforms.
Inventory. Display inventory is available through four main deal types, each with a different level of control and access:
Many programmatic display campaigns use a mix. They use the open exchange for reach, then PMPs and guaranteed deals for premium publishers and brand-safe placements.
Placements. Placements are where display ads appear on the page or screen. Common placements include:
Placement affects viewability and performance. Ads placed in or near the main content and ads that stay on screen longer are typically seen more often than ads at the bottom of a page.
It’s not especially glamorous, but it’s important to understand how ad formatting affects the process.
Most display ads still come in fixed pixel sizes, and a handful of them do the heavy lifting. The naming conventions below come from the IAB Tech Lab’s New Ad Portfolio, the industry’s shared standard for display units. (You’ll occasionally see different names for the same box—Google calls the 300×250 an “inline rectangle” while most of the industry calls it a “medium rectangle”—but the dimensions are what matter.)
| Size (pixels) | Common name | Where it tends to show up |
|---|---|---|
| 300×250 | Medium rectangle | In-content or sidebar; the most versatile size on the web |
| 728×90 | Leaderboard | Across the top, above the content |
| 160×600 | Wide skyscraper | Down the sidebar; strong view ability |
| 300×600 | Half-page | Sidebar; big, tall and hard to miss |
| 320×50 | Mobile banner | Anchored to the top or bottom of a phone screen |
| 970×250 | Billboard | Premium, above-the-fold real estate |
| 300×1050 | Portrait | Tall and immersive along the side |
Beyond fixed sizes, you’ll run into a few formats worth knowing:
An ad in the right size on the wrong screen is just wallpaper. Targeting is how programmatic display decides who sees what. These are the main approaches:
That last one deserves a spotlight, because it’s where programmatic display is heading. For years, a lot of targeting leaned on third-party cookies. Those are crumbling (or depending on who you ask, have already crumbled), and with them the old way of following anonymous browsers around the web. The answer isn’t to target blindly—it’s to target people, not cookies.
This is Epsilon’s bread and butter. Our approach is built on identity: connecting your first-party data to a privacy-conscious view of real individuals, so you can reach the same person consistently whether they’re on a laptop at lunch or a phone on the couch—and then actually measure what outcome those ads drove. It’s the difference between guessing and knowing, and it’s the honest answer to the worry that display “doesn’t work anymore” in a post-cookie world.
Here are a few example scenarios that show how programmatic display plays out.
Programmatic display is usually priced by CPM—that’s cost per thousand, or what you pay each time your ad is shown 1,000 times. You’re buying attention by the thousand, and the price swings based on how targeted and premium your buy is.
CPM ranges can vary a lot by industry, publisher, partner, etc. but Stackmatix offers a very high-level range of what advertisers may expect, knowing that actual CPM for any of the below objectives can shift based on any number of factors.
| Type of display buy | Typical CPM range |
|---|---|
| Broad audience, run-of-network | $1–$4 |
| Retargeting your own site visitors | $2–$8 |
| Behavioral or interest-targeted | $4–$10 |
| B2B, job-title or firmographic targeting | $10–$25 |
A few things push that number up or down:
The trap to avoid: chasing the cheapest CPM. A bargain impression nobody sees—or a bot sees—isn’t a bargain. It’s smarter to weigh cost against viewability and real outcomes. Want to learn more about digital media metrics? We've got the guide for you.
A few habits separate campaigns that perform from campaigns that just spend:
Short answer: yes—when it’s done right.
The skepticism is understandable. Banner blindness is real, third-party cookies are not reliable and plenty of display budgets have been spent on impressions no one ever saw. But that doesn’t mean the channel is broken—it means the old, spray-and-pray version is no longer viable for marketers today.
Modern programmatic display has staying power largely because of three things: identity-based targeting that reaches real people instead of cookies, frequency control that respects your audience and rigorous measurement that connects ad exposure to actual results. Get those right and display goes back to doing what it’s always been good at—building awareness and driving action, efficiently and at scale.
That’s exactly what we help brands do. pair identity-powered targeting with cross-device measurement, so you can reach the right people, control how often they see you and prove what your display advertising delivered. If “does display still work?” has been nagging at you, we’d love to show you the version that does.
It’s the automated buying and selling of visual banner ads across websites and apps, using software and real-time auctions to place the right ad in front of the right person—no manual negotiation required.
Display is the format—the visual banner or rectangle in an ad slot. Programmatic is the method—the automated, data-driven way that ad space gets bought and sold. Display is the what; programmatic is the how.
It’s typically priced on a CPM (cost per thousand impressions) basis. Per 2026 benchmarks, a reasonably targeted campaign often runs $4–$10 CPM all-in, with broad buys lower and precise B2B targeting higher. Price rises with targeting precision, inventory quality and demand.
Common ones include retargeting banners that follow up with recent site visitors, prospecting ads that introduce a brand to lookalike audiences and dynamic product ads that show each person the specific items or offers they browsed.
Yes—when paired with identity-based targeting, thoughtful frequency control and proper measurement. Those three turn display from background noise into a reliable driver of awareness and action.
Choose a suggested prompt to keep going after reading
