Digital Marketing Google Display Network Ads
Google Display Network (GDN) is a collection of over 2 million websites, apps, and videos where Google shows image and banner ads. It reaches more than 90% of internet users worldwide. When you visit a news website and see a banner ad for a shoe brand, or open a free app and see an image ad — that is likely the Google Display Network at work.
Display ads do not wait for people to search. They appear while people are browsing, reading, watching, or using apps — putting the brand in front of them before they even think to search.
The Billboard on the Highway Diagram
Search ads are like a shop that only opens when someone walks up and knocks on the door. Display ads are like billboards on a highway — everyone driving past sees them, whether they were looking for that brand or not.
Most people are not actively searching for a product at any given moment. Display advertising reaches them during the many hours they spend consuming online content — building brand awareness, reminding them of products they considered before, and generating demand before intent is formed.
Display Ads vs. Search Ads
| Feature | Search Ads | Display Ads |
|---|---|---|
| Trigger | User's active search query | User's interests, browsing behaviour, or website context |
| Format | Text only | Images, animated banners, videos, rich media |
| Primary goal | Capture existing demand | Build awareness and re-engage previous visitors |
| Audience mindset | Actively looking for a solution | Passively browsing — not searching |
| Click-through rate | Higher (2% to 5%) | Lower (0.1% to 0.5%) but massive reach |
| Cost per click | Generally higher | Generally lower |
Display Ad Formats
Static Image Ads
Simple image files in standard sizes. Google accepts multiple sizes including 300x250 (medium rectangle), 728x90 (leaderboard), 160x600 (wide skyscraper), and 320x50 (mobile banner). Designing ads in these standard sizes ensures they fit across the widest range of websites in the network.
Responsive Display Ads
The advertiser provides multiple headlines, descriptions, images, and a logo. Google automatically tests combinations and assembles ads that fit any available ad space on any website. Responsive Display Ads save design time and consistently outperform static ads in most campaigns because Google optimizes the combination for each placement.
Animated Ads
GIF or HTML5 format ads that include motion. Animated ads attract more attention than static ones but must comply with file size limits and Google's animation guidelines.
Display Targeting Options
The strength of display advertising lies in targeting — showing the right ad to the right person on the right website.
Audience Targeting
- Affinity audiences: People with strong, established interests — "cooking enthusiasts," "fitness buffs," "tech early adopters." Google builds these segments based on long-term browsing patterns.
- In-market audiences: People actively researching a purchase in a specific category right now — "in-market for cars," "in-market for home loans." These audiences have the highest purchase intent of any display targeting option.
- Custom intent audiences: Build an audience from people who have recently searched specific keywords on Google. This bridges the gap between search and display targeting.
- Customer match: Upload a customer email list and show ads to those specific people as they browse the web.
- Lookalike audiences (Similar segments): Google identifies new users who share characteristics with existing customers or website visitors.
Contextual Targeting
Show ads on websites covering topics relevant to the business. A cooking oil brand targets websites covering recipes, food blogs, and nutrition articles. The ad appears in the right context, in front of an audience already engaged with relevant content.
Placement Targeting
Manually select specific websites, YouTube channels, or apps where the ads should appear. A luxury car brand can choose to appear only on premium automotive websites rather than the entire Display Network.
Remarketing (Retargeting)
Show ads specifically to people who have previously visited the website. This is covered in depth in the next topic, but it remains one of the most effective display targeting strategies available.
Creating Effective Display Ads
Visual Hierarchy
A display ad has less than one second to capture attention. The most important message goes largest and boldest. Supporting information follows in smaller text. The call to action button stands out with a contrasting colour.
Brand Consistency
Display ads appear across thousands of websites. Consistent use of brand colours, fonts, and logo ensures that repeated exposures build brand recognition. Even when someone does not click an ad, seeing the brand name and logo regularly creates familiarity that pays off at the moment of purchase.
Clear Call to Action
Every display ad needs one specific call to action: "Shop Now," "Get a Free Quote," "Download Today," "Book a Demo." Vague CTAs like "Learn More" perform significantly lower than specific, benefit-oriented ones.
Message Match
The ad's promise must match the landing page's content. An ad offering "50% off all laptops today" that sends people to a general electronics homepage wastes the click. Send people directly to the laptop sale page to confirm the offer the moment they arrive.
Display Campaign Settings
Frequency Capping
Limit how many times a single user sees the same ad per day or week. Without frequency caps, the same person sees the same ad dozens of times — which becomes annoying and damages brand perception. A cap of 3 to 5 impressions per user per day balances visibility with user experience.
Brand Safety Exclusions
Exclude sensitive content categories and specific websites where the brand should not appear — controversial news sites, low-quality content, or websites with content misaligned with the brand's values. Placing a premium brand ad next to low-quality or inappropriate content damages the brand's perceived value.
When to Use Display Advertising
- Launching a new product or brand that people are not yet searching for
- Retargeting website visitors who did not convert
- Building awareness in a new geographic market
- Staying visible to warm audiences during long purchase decision cycles (real estate, insurance, automobiles)
- Reaching in-market audiences researching competitor products