The Google Display Network (GDN) is the collection of websites, mobile apps and video pages, outside Google's own search results, on which advertisers using Google Ads can place banner, image, native and video ads. Google's Help Center defines it as "a group of more than 2 million websites, videos, and apps" and, citing Comscore, says those sites reach over 90% of internet users worldwide. It exists because most of the web is not a search engine. Publishers need a way to sell space next to their content without a sales team, and Google needed a way to sell advertisers reach beyond the moment someone types a query. The network joins the two: advertisers buy inside Google Ads, and publishers supply space through AdSense, AdMob and Google Ad Manager.

The name refers to inventory, not a product with its own login. As of October 2026 Google still uses it, but the campaign type that most advertisers used to buy it, Display, is being retired in favour of Demand Gen.

How an impression reaches the network

The flow starts on the sell side. A blogger who installs AdSense code, an app developer who integrates the AdMob software development kit (SDK), or a larger publisher running Google Ad Manager makes an ad slot available. When a page loads, an ad request is sent to Google's exchange, AdX, which runs an auction among eligible buyers.

Google Ads is one of those buyers, and by far the most numerous. Behind it sit millions of advertiser accounts. Every Display, Demand Gen and Performance Max campaign that is eligible for that slot competes in an internal auction first, ranked on bid, predicted performance and creative fit; the winner's bid is then submitted to the exchange against other demand-side platforms (DSPs) and networks. The highest qualifying bid serves.

The money is split twice. In a November 2, 2023 post, Dan Taylor, Google's vice president of global ads, said that when Google Ads buys display ads it keeps about 15% of advertiser spend on average, while AdSense publishers receive 80% of what remains, for an overall share of roughly 68%. That is the same 68% figure Neal Mohan disclosed for AdSense for content in May 2010. The same post moved AdSense from paying mostly per click to paying per impression, the standard unit in display.

Google Ads can also buy outside Google's exchange. In the US remedies opinion, Judge Leonie Brinkema found that the buying tool, still called AdWords in court documents, had integrated with about 50 third-party exchanges but placed only about 3% of its impressions outside AdX, as PPC Land reported on September 17, 2026. Some of that external supply surprises advertisers: inventory on X has been reachable through Display Network enablement in Performance Max, Demand Gen and Display campaigns, according to a consultant cited in January 2026.

Targeting, formats and bidding

Buyers choose where ads appear in two broad ways. Contextual targeting uses keywords, topics or named placements (a domain, an app, a YouTube channel). Audience targeting uses segments: affinity and in-market groups modelled by Google, custom segments built from keywords and URLs, demographics, and first-party lists such as website visitors or uploaded customer data. Optimised targeting lets Google look beyond those inputs, a setting on by default in many campaigns.

The dominant format is the responsive display ad: the advertiser uploads headlines, descriptions, images and logos, and Google assembles combinations to fit each slot. Uploaded image ads in fixed sizes remain, while HTML5 and third-party served ads are still on Google's roadmap for Demand Gen, planned for late 2026.

Pricing options historically included cost per click (CPC), viewable cost per thousand impressions (vCPM) and a pay-for-conversions model. Automated strategies such as Target CPA and Target ROAS increasingly replaced manual bids, and Google retired Enhanced CPC for Display by March 2025.

From content network to Demand Gen channel

Google's display business began with contextual text ads. In March 2003 it announced a content targeting service and, on June 18, 2003, opened it to a broader set of sites as AdSense, an anniversary PPC Land revisited in 2026. Sergey Brin said the aim was to "strengthen the long-term business viability of content creation on the web." For advertisers, the inventory was known as the content network.

Two acquisitions widened it. Google closed its purchase of DoubleClick on March 11, 2008, which brought an ad server and an exchange, and AdMob followed in 2010 for mobile apps. On June 18, 2010, Neal Mohan, then vice president of product management, renamed the content network. "The Google Display Network will comprise all of the sites (apart from search sites), where you can buy ads through Google," he wrote, adding YouTube, Gmail, Google Maps, Google Finance and Blogger to more than one million partner sites, including AdSense and DoubleClick Ad Exchange publishers. AdWords became Google Ads in July 2018.

The latest shift is administrative but large. On May 26, 2026, Google announced that "Google Display Ads has a new home in Demand Gen," a change PPC Land summarised as the end of Display campaigns. A migration tool began rolling out in June 2026; it carries up to 42 days of performance history, and Google expects the transition to finish by 2027. Migrated campaigns cannot be reverted. Manual CPC, viewable impressions bidding, pay for conversions, bid adjustments and portfolio bid strategies are not supported in Demand Gen, and shared budgets must be removed before migration. Earlier steps pointed the same way: Demand Gen gained channel controls including GDN in early 2025, and Display & Video 360 (DV360) let Demand Gen line items serve image ads on GDN from April 2025.

Why marketers watch it

For small and medium advertisers, the network is often the only programmatic display they ever buy. No minimum spend, self-serve setup and a single bill made it the default route to the open web, which PPC Land's explainer on open-web display describes as one source of demand rather than the market itself.

It also matters as a revenue line. Google reports network advertising separately, and the figures have been sliding: Network revenue fell 4% to $6.97 billion in the first quarter of 2026 and slipped 1% to $7.303 billion in the second, while total advertising revenue rose 14% to $81.6 billion. By mid-2025, about 90% of Google's advertising revenue came from its own properties. Google itself told the court that open-web display was in rapid decline, an argument it used against a forced sale of AdX.

Limitations and disputes

Placement quality is the oldest complaint. Automated targeting tends to find cheap inventory, and cheap inventory includes made-for-advertising (MFA) sites. The Association of National Advertisers' June 2023 study found MFA took 21% of impressions and 15% of spend in its sample, and Adalytics reported in March 2024 that major brands' ads still ran on such sites through Google among others, as PPC Land's MFA explainer records. Low-priced app inventory and accidental clicks in mobile games draw similar criticism.

Transparency is the second. Performance Max mixes GDN with Search, YouTube and other channels, and advertisers long lacked an opt-out; Google began an alpha in July 2026 that lets some advertisers untick the Display Network. Kyle Rovinski of Duncan Channon summarised the earlier objection: "the product could not be trusted." Planning tools have also thinned, with Performance Planner dropping Display and Video support on March 9, 2026.

Competition is the largest dispute. The European Commission's September 5, 2025 decision, which fined Google 2.95 billion euros, found that Google Ads and DV360 mainly routed bids to AdX and avoided rival exchanges. Teads, in a suit filed on August 3, 2026, alleges that about 90% of Google Ads demand flows exclusively through AdX and that rival exchanges lost 6.88 trillion impressions between 2017 and 2023. Those are allegations; Google contests them.

Even Google's own reach numbers diverge. Its 2026 materials cite more than 2 million sites, videos and apps, while AdsLiaison communications reported in early 2025 described more than 3 million sites and apps.

Not the same as

AdSense. The publisher-side programme that supplies much of the network's inventory. GDN is what advertisers buy; AdSense is how smaller publishers sell.

Google Ad Manager and AdX. The ad server and exchange for larger publishers. AdX also sells to buyers other than Google Ads, so its inventory is broader than GDN.

DV360. Google's enterprise DSP. It can reach GDN through Demand Gen line items, but it buys across dozens of exchanges and sits outside the US decree.

Google Video Partners. Video inventory on sites and apps outside YouTube, sold mainly through video and Demand Gen campaigns. It overlaps with GDN but is targeted and reported separately.

Recent developments

The US remedies case now shapes how the network buys. Judge Brinkema's September 2 opinion, unsealed on September 16, bars Google Ads from bidding directly into Google's publisher ad server for indirect open-web display, while allowing it to bid through Prebid; forbids it from favouring AdX solely because Google owns it; and limits the use of Search, YouTube and Gmail data to personalise open-web display impressions. The parties filed a proposed final judgment on October 2, 2026, with competing timelines of six and 12 months for several provisions. As of October 14, 2026 the judgment had not been entered, according to the most recent PPC Land report, dated October 6; the decree runs six years from entry and applies globally.

The migration to Demand Gen continues alongside it. When the switch completes, the network will survive as a channel inside Demand Gen and Performance Max, not as a campaign type of its own.

Timeline

  • March 2003: Google announces a content-targeted advertising service
  • June 18, 2003: AdSense opens to a broad range of websites
  • March 11, 2008: Google closes its acquisition of DoubleClick
  • May 24, 2010: Google discloses a 68% AdSense for content revenue share
  • June 18, 2010: The content network is renamed the Google Display Network
  • July 2018: AdWords becomes Google Ads
  • November 2, 2023: Google announces AdSense per-impression payments and a split buy-side and sell-side fee
  • March 2024: Adalytics reports major brands' ads on MFA sites through Google and others
  • January 30, 2025: Google announces Demand Gen channel controls, including GDN
  • March 2025: Enhanced CPC retired for Display campaigns
  • April 2025: DV360 Demand Gen line items begin serving image ads on GDN
  • September 5, 2025: European Commission fines Google 2.95 billion euros over ad tech
  • March 9, 2026: Performance Planner drops Display and Video support
  • May 26, 2026: Google announces Display campaigns are moving to Demand Gen
  • June 2026: Migration tool rollout begins
  • July 2026: Performance Max alpha lets some advertisers opt out of GDN
  • August 3, 2026: Teads sues Google in New York
  • September 2, 2026: Judge Brinkema declines to order an AdX sale and adopts behavioural remedies
  • September 16, 2026: Remedies opinion unsealed
  • October 2, 2026: Proposed final judgment filed
  • 2027: Expected completion of the Display to Demand Gen migration

Summary

Who. Google operates the network. Advertisers buy it through Google Ads and, for Demand Gen line items, DV360; publishers supply it through AdSense, AdMob and Google Ad Manager, with AdX running most auctions.

What. A pool of more than 2 million websites, apps and video pages outside Google search where display, native and video ads appear, bought with contextual and audience targeting and mostly automated bidding.

When. It grew from AdSense in 2003, took its current name on June 18, 2010, and is moving from standalone Display campaigns into Demand Gen between June 2026 and 2027.

Where. On the open web and in apps, plus Google properties such as YouTube and Gmail when campaigns include them, with Google Ads acting as the buyer inside AdX and, to a small degree, other exchanges.

Why. It gives small advertisers self-serve reach beyond search and gives publishers a way to sell space without a sales team. Its routing of demand through AdX has made it central to antitrust cases in the US and Europe.