Display advertising is paid visual advertising shown across websites, mobile apps, and social platforms — including banner ads, sidebar ads, interstitials, and video placements. Unlike search ads that respond to intent, display ads interrupt browsing and are typically priced on CPM (cost per thousand impressions) or CPC (cost per click).
Display advertising is the internet's answer to billboards, with one enormous advantage: the billboard changes based on who is looking at it. Used well, it's how brands build awareness and pull cold audiences back for the second click.
What is display advertising?
Display advertising is any paid visual ad placement on a third-party website, mobile app, or social platform. It groups into a few standard formats: image banners, responsive display ads, interstitials, and short video units. Buyers pay per impression (CPM), per click (CPC), or on cost-per-acquisition targets.
Display works differently from search advertising. A search ad captures existing intent — the user just typed the query. A display ad creates or nurtures intent by showing up while the user is doing something else entirely.
The Google Display Network reaches about 90% of internet users across 2M+ websites and 650K+ apps, making it the default surface for display advertising. Programmatic buying platforms (DSPs) add access to independent ad exchanges, connected TV, and open-web inventory.
Why display advertising matters
- Brand awareness at scale. CPMs as low as $1-$5 make it possible to reach millions of impressions with modest budgets.
- Retargeting horsepower. Display is the primary channel for re-engaging past website visitors. Retargeted audiences convert several times higher than cold audiences.
- Visual storytelling. Images, animations, and short video communicate positioning in ways search text ads never can.
- Full-funnel coverage. Sequence creatives from awareness through consideration to conversion in one channel.
- Precise targeting. Contextual, audience, placement, and topic targeting narrow reach to who matters.
How display advertising works
A single impression is the result of a real-time auction between advertisers competing for the same slot on the same page for the same user.
1. User loads a webpage with an ad slot
2. Publisher's SSP broadcasts the impression to ad exchanges
3. Advertisers' DSPs evaluate the user + placement + bid
4. Highest bidder wins → ad renders in the slot
5. Advertiser is charged CPM or CPC based on outcome
# All of this happens in about 100 milliseconds
Buying models
- Self-serve platforms — Google Ads, Meta Ads Manager, LinkedIn Campaign Manager
- Programmatic DSPs — DV360, The Trade Desk, StackAdapt
- Direct publisher deals — guaranteed placements bought directly from the publisher
Display ad formats
| Format | Common size | Best for | Notes |
|---|---|---|---|
| Medium rectangle | 300x250 | General awareness | Highest-fill IAB standard |
| Leaderboard | 728x90 | Header/footer placements | Desktop-strong |
| Wide skyscraper | 160x600 | Sidebar placements | Longer dwell, lower CTR |
| Mobile leaderboard | 320x50 | In-app inventory | Highest mobile fill |
| Responsive display | Auto | Multiple placements at once | Assets adapt to slot size |
| Interstitial | Fullscreen | App transitions, high-intent moments | High viewability, high CPM |
| Video display | 16:9 / 9:16 | Story, product demo | Higher engagement, higher cost |
Real display advertising examples
Two anonymised results from client campaigns:
1. DTC retail · dynamic retargeting
CTR: 0.70% (2x display benchmark)
ROAS: 10:1
Reason: warm audience + product-specific creative
2. Dental practice · local brand campaign
Branded searches: +45% vs pre-campaign baseline
Direct site visits: +22%
Reason: display seeded demand, search captured it
Display vs search advertising
Different jobs, different rules of thumb. Most brands need both.
Display advertising
- Creates demand from people not yet searching
- Enormous impression volume, low CTR
- Visual, brand-friendly formats
- Retargeting and awareness superpower
- Longer path to conversion
Search advertising
- Captures existing high-intent demand
- Lower impression volume, higher CTR (~3.17%)
- Text-first, response-driven formats
- Direct-response engine
- Shorter path to conversion
7 display advertising best practices
- Start with retargeting. Warm audiences outperform cold audiences at every stage of the funnel — expect 5-10x higher CTR.
- Test creative aggressively. Creative accounts for the majority of performance variance. Run 5+ variants and let data pick the winner.
- Cap frequency. Nothing burns a brand faster than showing the same ad 30 times to the same user. Cap at 3-5 impressions per day.
- Use responsive display ads. Provide assets in multiple sizes and let Google auto-fit to available slots.
- Exclude junk placements. Regularly review the placement report and exclude domains that produce impressions without conversions.
- Measure view-through, not just click-through. Display's job is often to influence, not to close. Attribution needs to reflect that.
- Pair with search. Display seeds demand; search captures it. Look at total incremental conversions, not channel-siloed CTR.
A 0.35% CTR is normal for display; it would be catastrophic for search. If you optimise a display campaign on the same KPIs as a search campaign, you'll cut awareness spend that was actually working further up the funnel.
Common display advertising mistakes
- No frequency cap — users see the same ad 50 times and start actively resenting the brand.
- One creative for all audiences — cold, warm, and existing customers need different messages.
- Blindly trusting "smart" targeting — audit placements weekly to catch made-for-advertising sites and low-quality apps.
- Measuring on last-click only — strips display of credit for the impressions that seeded demand.
- Ignoring viewability — impressions below the fold at 50% visibility don't move the needle.
How theStacc helps
theStacc keeps your organic side compounding while your display program handles awareness and retargeting. We map the queries your display ads seed demand for, produce landing pages that convert the resulting traffic, and monitor the search-lift attribution so display gets full credit for its work.
Frequently asked questions
Yes for brand awareness and retargeting at $500-$2,000/month, though search ads usually deliver better direct-response ROI. Display works best when paired with a strong retargeting audience.
Display ads interrupt browsing rather than answering an active search. The average display CTR is around 0.35% versus 3.17% for search ads. Low CTR still delivers meaningful traffic at scale because impressions are massive.
Both. Search captures existing demand from people already looking. Display creates and nurtures demand from people who don't know they need you yet. Most mature programs run both simultaneously.
The most common IAB standard sizes are 300x250 (medium rectangle), 728x90 (leaderboard), 160x600 (wide skyscraper), 320x50 (mobile leaderboard), and 300x600 (half-page).
Google's ad inventory network that reaches roughly 90% of internet users across 2M+ websites and 650K+ apps. It's the largest display advertising surface and the default buying platform for most advertisers.
Related glossary terms
Sources
- [01]Google Ads — About Display Network
- [02]WordStream — Google Ads industry benchmarks (display vs search CTR)
- [03]IAB Tech Lab — Display ad size standards
- [04]Think with Google — Display advertising benchmarks
- [05]theStacc internal client audits — 2025-2026
