What Are Display Ads & How Do They Work?

Display ads are visual advertisements, including images, banners, and short videos, placed on websites, apps, and social platforms to reach people while they browse. They work by buying ad space through direct deals, ad networks, or programmatic exchanges, then targeting that space to specific audiences based on interests, behavior, or past visits to your site.

If you've ever scrolled a news site and had a banner follow you down the page, you've already met display ads. They're one of the oldest formats in digital marketing, and they're still one of the most misunderstood, mostly because "display ads" gets used as a catch-all for a handful of very different things.

That's the 60-second version. The rest of this guide breaks down how display ads actually work behind the scenes, the formats you'll run into, and how to build a campaign that doesn't just get seen. It gets clicked.

What Are Display Ads, Exactly?

Display ads are visual ads that show up in the "real estate" around content: the sidebar of a blog, the top of a mobile game, or a banner in your inbox. Unlike search ads, which appear because someone typed a query, display ads show up while someone's doing something else entirely: reading, scrolling, or watching.

That distinction matters more than most guides let on. Search ads catch people mid-intent. Display ads catch people's mid-attention. That's a different job, and it changes how you should think about creative targeting and what "success" even looks like.

You'll usually see display ads in a few common spots:

• Banners along the top, side, or bottom of a webpage

• In-feed native ads that blend into an app or social feed

• Video ads that play before or during content

• Full-screen interstitials between app screens or game levels

Take an education brand like Improve ME Institute. One set of banners tests different angles, personalized learning, exam-focused revision workshops, home-schooling support, each with its own headline and photo, run side by side to see which message parents respond to. Once someone visits the site without booking, a separate retargeting ad follows them with a more direct offer: "Book a Free Assessment." That's not a coincidence either. It's a display ad campaign doing exactly what it's built to do, testing creative up top and closing the gap on the back end.

How Do Display Ads Work?

Here's the part most people skip past: display ads work through an actual buying and placement system, not magic. Understanding that system is what separates campaigns that burn through their budget from those that don't.

There are three main ways advertisers buy display ad space:

1. Direct Buying

You negotiate directly with a publisher, meaning a specific website or app, for a set placement, timeframe, and price. It's the oldest model, and it still works well when you know exactly where your audience spends time. The tradeoff is scale: direct deals are hard to manage across dozens of sites at once.

2. Ad Networks

Ad networks pool ad space from thousands of sites and let you target by interest, behavior, or demographic instead of negotiating site by site. This is how most small and mid-sized businesses get into display advertising. It's accessible, and you're not stuck emailing publishers one at a time.

3. Programmatic Advertising

Programmatic buying runs on real-time auctions through ad exchanges. Software bids on impressions on your behalf, in milliseconds, based on rules you set. It's the most scalable option and gives you the clearest visibility into where your money actually lands, but it also has the steepest learning curve.

How You Pay for Display Ads

Pricing follows the buying model. The two you'll run into constantly:

Types of Display Ads

Display ads aren't one format. They're a family of formats, and choosing the wrong one for your goal is a common (and expensive) mistake.

By format:

• Banner ads: static or lightly animated images in a fixed placement

• Native ads: designed to match the look of the surrounding content, so they don't feel like an interruption

• Video ads: short clips shown on sites, apps, or streaming platforms

• Interstitial ads: full-screen ads that appear between app screens, usually with higher engagement and higher annoyance risk in equal measure

By delivery method:

• Responsive display ads: you upload images, headlines, and logos, and the platform assembles them into whatever layout fits the placement

• Retargeting ads: shown specifically to people who already visited your site or engaged with your brand, which is usually where display ads earn their keep on conversions

If brand awareness is the goal, native and video tend to outperform. If you're chasing conversions from people who already know you, retargeting almost always wins.

How to Create Display Ads That Actually Perform

Knowing how display ads work is one thing. Building ones people don't scroll past is another. Here's the process that holds up in practice:

1. Pick the Platform Your Audience Actually Uses

Don't default to the biggest network out of habit. A B2B company chasing decision-makers will get more out of a professional-audience network than a broad consumer one. Match the platform to where your buyer already spends time, not where it's easiest to set up a campaign.

2. Write Copy That Leads With the Benefit

Nobody clicks a banner because they're impressed by a feature list. State what changes for them, whether that's faster results, lower cost, or less hassle, and back any number you use. "Cut onboarding time in half" earns more clicks than "Advanced onboarding tools."

3. Design for a Five-Second Glance

Display ads get scanned, not read. One focal point, legible on a phone screen, and brand colors consistent enough that people recognize you before they finish reading the copy. If someone has to squint, you've already lost them.

4. Set Up Retargeting From Day One

Most first-time visitors won't convert on the first impression. A retargeting layer that follows warm visitors with a display ad is one of the highest-leverage moves you can make early, and it's usually cheap relative to cold prospecting.

5. Test One Variable at a Time

Change the image, or the headline, or the CTA, but not all three at once. Otherwise you'll know something worked without knowing what. Give each test enough impressions to be statistically meaningful before you call a winner.

6. Track the Metrics That Match Your Goal

• Impressions: how often the ad was shown

• CTR (click-through rate): the percentage of viewers who clicked

• Conversion rate: the percentage who completed your target action

• CPA (cost per action): what each conversion actually cost you

• ROAS (return on ad spend): revenue generated per dollar spent

Don't judge an awareness campaign by conversion rate, and don't judge a retargeting campaign by impressions alone. Match the metric to what the campaign was actually built to do.

Are Display Ads Worth It?

Honestly, it depends on what you're trying to accomplish. Display ads are strong for building awareness, staying visible to people who've already shown interest, and testing creative at scale cheaply. They're weaker as a stand-alone conversion driver for cold audiences. That's usually a search or social's job.

The campaigns that work best treat display as one layer in a bigger strategy: search captures intent, display builds and sustains awareness, and retargeting closes the gap between the two.

Final Thoughts

Display ads aren't a magic switch, but they're not just noise either. Once you understand how the buying models work, which format fits your goal, and where retargeting fits into the picture, they become a lot more predictable to run.

Start with a small budget, watch the metrics that actually match what you're trying to achieve, and let the data tell you where to scale. That's how display ads go from an expense you're not sure about to a channel that reliably earns its place in your marketing mix.

FAQs

What are display ads in simple terms?

Display ads are visual ads, such as images, banners, or videos, shown on websites, apps, and social platforms to reach people while they browse, rather than while they're actively searching.

How do display ads work compared to search ads?

How much do display ads cost?

How do I create display ads without a design team?

Are display ads effective for small businesses?