What You Will Learn
- What the Google Display Network is and what properties it includes
- How display advertising fundamentally differs from search advertising
- Every targeting method available — contextual, audience, placement, topic, demographic
- How placement targeting works and how to control where ads appear
- Display-specific bidding models — CPM, CPC, CPE, target CPA
- When to use display for awareness vs when to use it for conversion
- Brand safety controls and how to prevent ads appearing on inappropriate content
What is the Google Display Network
The Google Display Network (GDN) is Google's network of publisher websites, mobile apps, and Google-owned properties where display ads can appear. It includes over 2 million websites and apps, reaching an estimated 90%+ of global internet users. Google-owned properties within the GDN include YouTube, Gmail, and Google Discover.
Display ads are visually-based formats — image banners, animated GIFs, HTML5 ads, video ads (on YouTube), and native-style ads. They appear within the content of publisher pages rather than in response to search queries. This distinction has fundamental implications for targeting strategy, creative requirements, and performance expectations.
GDN reach
Of internet users globally
Properties
Websites and apps in the network
Ad formats
Sizes from 300x250 to 970x250
Display vs Search: Fundamental Differences
| Dimension | Search | Display |
|---|---|---|
| User intent | Active — user has expressed a specific need | Passive — user is engaged with other content |
| Targeting | Keyword-based (what they search) | Audience and context-based (who they are, what they read) |
| Ad format | Text only (headlines + descriptions) | Visual — images, animation, video, HTML5 |
| CTR expectations | 3–10% is typical | 0.1–0.5% is typical — display CTR is inherently lower |
| Primary role | Capture existing demand | Create and nurture demand |
| Conversion rate | Higher — intent-matched clicks | Lower — interruption-based clicks |
| Funnel position | Bottom — near purchase decision | Top and mid — awareness and consideration |
Display's low CTR should not be interpreted as poor performance — most display impressions have value even without a click through brand recall and frequency effects. Evaluating display solely on direct click conversion rate misses the upper-funnel contribution. View-through conversions (conversions from users who saw but did not click a display ad) are one measurement approach, though they require careful attribution methodology.
Display Targeting Methods
| Targeting Type | How It Works | Best For |
|---|---|---|
| Contextual (Keywords) | Ads appear on pages whose content matches your keyword list | Reaching users reading about relevant topics |
| Topic Targeting | Ads appear on pages in specific topic categories (Sports, Technology, etc.) | Broad contextual targeting by subject matter |
| Placement Targeting | You choose specific websites or apps where ads will appear | High-control placement on known relevant sites |
| In-Market Audiences | Reaches users Google has identified as actively researching a purchase category | Users in a buying cycle for your product category |
| Affinity Audiences | Reaches users with long-term interests in specific topics | Brand awareness to relevant lifestyle audiences |
| Custom Segments | Build audiences from search terms, URLs visited, or app usage | Highly targeted intent-based display audiences |
| Remarketing | Reaches users who have previously visited your website | Re-engaging prior visitors; highest conversion rates in display |
| Demographics | Target by age, gender, parental status, household income | Narrowing audience by demographic characteristics |
| Similar Segments | Reaches users similar to your existing customers or site visitors | Prospecting new audiences similar to known converters |
Placement Targeting
Placement targeting lets you select specific websites, YouTube channels, YouTube videos, apps, or app categories where your ads will appear. It provides maximum control over where your ads are seen — useful when you know specific high-quality, relevant placements for your audience.
Managed vs automatic placements
Without placement targeting, the GDN automatically places ads across the network based on your other targeting signals (contextual, audience). These are "automatic placements." When you add specific placement targets, your ads are restricted to those sites — called "managed placements." Most campaigns run on automatic placements unless there are specific sites that are particularly valuable or specific sites to avoid.
Placement exclusions
Placement exclusions remove specific sites, apps, or categories from your display targeting. Run the Placements report regularly — you will find traffic from apps, parked domains, and low-quality sites that consume budget without contributing conversions. Common exclusions: mobile app categories (especially "Games" for B2B campaigns), parked domains, error pages, and specific low-quality publisher sites identified from the report.
Display Bidding Models
| Bidding Model | You Pay For | When to Use |
|---|---|---|
| Target CPM (Cost Per Thousand) | Every 1,000 impressions | Brand awareness campaigns where reach is the goal |
| Target CPA | When a conversion occurs (Smart Bidding) | Conversion-focused campaigns with 50+ conversions/month history |
| Maximise Conversions | Clicks that lead to conversions (Smart Bidding) | Maximising conversion volume within budget |
| Viewable CPM (vCPM) | Only viewable impressions (50%+ on-screen for 1+ second) | Brand awareness — more efficient than CPM for actual viewability |
Display Campaign Objectives
Brand awareness campaigns
Use broad audience targeting (Affinity, Demographics), CPM or vCPM bidding, and measure by reach, frequency, and brand lift (measurable through Google's brand lift studies for qualifying campaign budgets). Creative should be visually distinctive and brand-forward.
Consideration campaigns
Target In-Market and Custom Segments audiences. Measure by engagement metrics (CTR, landing page views). Creative should communicate product benefits and differentiation.
Remarketing/conversion campaigns
Target site visitors, cart abandoners, and past customers. Use Target CPA or Target ROAS bidding. Creative should address objections and provide conversion incentives (limited offers, testimonials).
Brand Safety Controls
Brand safety ensures your ads do not appear alongside content inappropriate for your brand. Google provides several content exclusion controls:
- Inventory type. Expand Standard Inventory to reach all GDN; restrict to Limited Inventory to only show on content meeting higher safety standards. For sensitive brands, Limited Inventory reduces scale but improves placement quality.
- Content exclusions. Exclude specific content categories: Tragedy and Conflict, Sensitive Social Issues, Sexually Suggestive Content, Profanity and Rough Language, Sensational and Shocking. Enable at campaign level.
- Placement exclusions. Exclude specific known problematic URLs, apps, or YouTube channels. Maintain an account-level exclusion list for sites identified through regular auditing.
- Digital Content Label exclusions. Exclude content labels: DL-G (suitable for all ages), DL-PG (parental guidance), DL-T (teen), DL-MA (mature audiences). For children's products, restrict to DL-G.
Authentic Sources
Official GDN overview including reach, properties, and targeting capabilities.
All display targeting options including contextual, audience, and placement.
Managed vs automatic placements and placement exclusions.
Content exclusions, inventory type, and digital content labels.