Display Advertising

Display advertising is the buying of visual ads, such as banners, images, and rich-media units, that appear on websites and in apps. In Google Ads it runs through the Google Display Network, a collection of publisher sites and apps, and in Performance Max and Demand Gen campaigns that include display inventory. Outside Google, programmatic platforms buy similar inventory across other exchanges. Ads are usually sold per thousand impressions (CPM), though some formats and bid strategies charge per click. Common formats include responsive display ads, where you supply images, headlines, and a logo and the platform assembles sizes, plus fixed-size banners and rich-media units with motion or interaction.

The mechanism is interruption plus targeting. A person reads a recipe, a news article, or plays a mobile game, and an ad fills a reserved slot. Which ad appears depends on signals the platform has: the page topic, the device, the audience lists you attach, the person's past site visits, and in some campaigns the platform's own predictions. Because the viewer was not searching for you, display seldom produces the immediate clicks that search does. Click-through rates are usually much lower than search, so judging display by clicks alone misreads what it does. Targeting options include audience segments, topics, keywords for page context, and specific sites or apps you name as placements. Naming placements gives the most control and the smallest scale.

Display fits three jobs. First, retargeting: showing ads to people who already visited your site or added an item to a cart, often with dynamic product creative. Second, cheap incremental reach alongside search or social, so more people recognize your name when they later search. Third, contextual targeting on pages related to your topic. It interacts with attribution settings heavily. Last-click models give display almost no credit, while data-driven attribution and view-through conversions give it more, and each setting can change how profitable display appears without any change in actual sales. View-through conversions count a purchase by someone who saw but did not click. They help show display's role, but they also credit it for sales that would have happened anyway, so read them cautiously.

The common mistake is running cold prospecting display with a conversion goal and grading it on last-click sales. It will look poor, because the format interrupts rather than captures existing intent. The second mistake is ignoring placements: automatic placements can land your ads on low-quality sites or apps, accidental taps, and children's games. Review placement reports, exclude weak ones, and consider an allowlist. A third mistake is using one generic banner for every audience instead of tailoring a message to the stage the viewer is at. Creative fatigue is real here. The same banner shown ten times to one retargeting audience gets ignored, so rotate two or three messages, such as a product reminder, a review quote, and a small offer.

Read display on more than clicks. Look at impressions, reach and frequency, view-through conversions, assisted conversions, and branded search volume before and after a flight. Retargeting should be judged on cost per conversion, preferably with a holdout, since some of those buyers would have returned anyway. This week, open your placement report, exclude the five worst-performing sites or apps by spend with no conversions, set a frequency cap on retargeting, and confirm display is not eating budget you intended for search. Keep landing pages consistent with the banner so the click does not feel like a bait and switch. Pair it with a clear exclusion list for converters. Retargeting someone who bought yesterday wastes impressions, and a simple purchaser exclusion often improves cost per conversion quickly.