Content Marketing Glossary

  • What is Display Ads?

What is Display Ads?

Display Ads

Display Ads are visual ads - banners, videos, rich media units - served on websites, apps, and platforms across the internet through ad networks and exchanges. Distinguished from search ads (text-based, intent-driven) and social ads (in-feed on social platforms) by their placement: third-party publisher inventory, usually shown to users who weren’t actively searching for anything related.

The format that built the modern web’s ad economy and the format most criticised for slowing it down. Heavy creative, programmatic complexity, and viewability problems have made display a controversial channel even as it remains a multi-billion-dollar business.

The display ad ecosystem, simplified

Publishers sell ad inventory on their sites - header ads, sidebar units, in-content placements, sticky footers.

Advertisers want to reach specific audiences with specific creative.

Ad exchanges match the two via real-time bidding (RTB) - milliseconds-fast auctions running while the page loads.

Demand-side platforms (DSPs) help advertisers buy across exchanges. Supply-side platforms (SSPs) help publishers sell. The plumbing layer between them.

Ad networks like Google Display Network aggregate publisher inventory and provide easier buying for advertisers who don’t want the full programmatic complexity.

What kills display ad performance

Three patterns:

Banner blindness. Users have learned to visually skip rectangular regions in standard ad slots. Click-through rates on display ads average 0.05-0.35%, compared to 1-3% for search ads. The format requires volume because individual response is so low.

Viewability and fraud. A meaningful chunk of display impressions are never actually seen by humans - bot traffic, ads loaded below the fold and never scrolled to, ads in browser tabs nobody looked at. Industry viewability standards have improved but the floor is still meaningfully above zero.

Ad blocker erosion. 25-40% of users in developed markets run some form of ad blocker. The audience reachable via display has shrunk relative to total internet users.

Where display ads still earn their slot

Three real use cases:

Retargeting. Showing display ads to users who already visited your site. Conversion rates are 5-10x higher than cold display because the audience is pre-qualified.

Brand campaigns at scale. Reaching millions of impressions cheaply for awareness work where direct response isn’t the goal.

Premium publisher direct buys. Skipping the programmatic exchanges and buying directly from a small set of high-quality publishers. More expensive per impression but the audience and brand-safety quality are dramatically better.

An example

A B2B SaaS team had been running programmatic display via a major DSP for six months - about $8K/month spread across thousands of publishers. Reported click-through rate: 0.18%. Reported conversions: about 12 trial signups per month. Cost per trial: roughly $670. Wildly unprofitable.

The audit found the display campaign was producing almost no incremental signups - the trial signups attributed to display were largely users who would have signed up anyway and happened to see a display ad somewhere in the funnel. Last-click attribution had been giving display credit it didn’t deserve.

They killed the cold display spend entirely. Kept retargeting only - about $1,500/month to users who’d visited the site in the past 30 days. Retargeting conversion rate ran around 4%, cost per trial dropped to about $80, and overall paid customer acquisition improved because the previously-wasted $6,500 went into channels that actually drove incremental volume.

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