The Google Display Network: a guide for businesses

The Google Display Network (GDN) is the set of websites, apps and Google properties where visual ads (images, banners and video) managed from Google Ads can appear. Unlike search ads, which appear when someone searches for something, Display ads appear while the person reads the news, watches videos or uses an app.

That's why it's good for two things: getting known by an audience that isn't looking for you yet, and showing up again for people who already visited your site (remarketing). This guide explains where the ads are shown, which formats to use, how to target, how to measure and which mistakes to avoid.

Where the ads appear

• Google properties: YouTube, Gmail and others.
• Partner websites: millions of sites that show Google ads through AdSense, from newspapers to niche blogs.
• Mobile apps: apps monetized through Google's network (AdMob).

You can let Google choose where to show your ads based on your targeting, or choose and exclude specific sites and apps.

Strengths and limits

For:

• Huge reach, useful for making your brand known.
• A visual format, ideal for products and brands that sell through the eyes.
• Cost per click generally lower than on the search network.
• Remarketing: Display's most profitable tool, because it speaks to people who have already shown interest.

Limits:

• Low intent: the person wasn't looking for what you sell, so it converts less than search.
• Low-quality clicks if you don't control where it appears (for example, in mobile games).
• It needs good images and a landing page that convinces quickly.

If you're torn between Display and other platforms, see the comparison of TikTok, Facebook, Instagram and Google ads.

Ad formats

Responsive display ads (recommended)

You upload images, a logo, headlines, descriptions and, optionally, video, and Google automatically builds combinations that fit the space available on each page. They're the default format and the one with the most reach.

Uploaded image ads

Banners you design in fixed sizes (for example, 300 × 250 or 728 × 90). They give total creative control, but you need a version for each size.

HTML5 ads

Animated or interactive banners. Eye-catching, but more expensive to produce and with technical requirements.

Video

Ads on YouTube and partner sites. They're managed as video campaigns, but they complement Display very well.

Google also offers campaigns that combine several networks automatically (such as Performance Max or Demand Gen). They're useful, but give you less control over where your ad appears; to start understanding what works, a Display campaign with clear targeting is easier to read.

How to target

By audience (who)

• Demographics: age, gender, family status and estimated income.
• Affinity: long-term interests and habits ("travel lovers", "sports enthusiasts").
• In-market: people Google detects actively researching a product or service. It usually performs better than affinity.
• Custom segments: you describe your audience with keywords, sites or apps they tend to use.
• Your data (remarketing): your site's visitors, your app's users or customer lists.

By content (where)

• Topics: pages about certain topics ("health", "cars").
• Placements: specific sites, YouTube channels or apps you choose.
• Content keywords: pages whose content relates to the words you define.

Combine with care: each layer of targeting reduces reach. Start with one or two and expand based on results.

Remarketing: where Display performs best

Most visitors leave without contacting you or buying. With remarketing, your ad appears to them again while they browse, reminding them of what they saw:

• To someone who looked at a service, show that service, not your home page.
• To someone who abandoned a cart, show the product they left.
• Exclude people who already bought, or show them complementary products.
• Cap the frequency so you don't wear people out.

To do it, your site needs the Google Ads tag installed from day one, so the lists start building.

Good practices for the ads

1. Sharp images of your own, with little text on top.
2. One message and one action per ad: "Price your website in 1 minute", not three ideas at once.
3. A recognizable brand: consistent logo and colors.
4. Several versions of headlines and images, so Google can test and you can learn.
5. A landing page that lives up to it: fast on phones and consistent with what the ad promised. See the responsive web design guide.

How to measure and optimize

• Conversions first: set up conversion tracking (forms, messages, bookings, sales) before launching. Without it, you'll only know how many clicks you paid for.
• Key metrics: click-through rate (CTR), cost per click (CPC), conversion rate and cost per result (CPA).
• Placements report: check where your ads were shown and exclude the sites and apps that spend without converting.
• Bid and budget adjustments: more to what works, less to what doesn't.

Common mistakes

• Targeting everyone. The reach is huge; your budget isn't.
• Not checking placements, and ending up paying for accidental clicks in apps.
• Measuring only impressions and clicks, without conversions.
• Sending the traffic to the home page instead of a specific page.
• Using Display to capture immediate demand. Search is better for that: see Google Ads for beginners.

How we do it at WEB.CR

We build sites with measurement ready: the Google Ads tag for remarketing, conversions on forms, bookings and payments, and fast landing pages for each service. That way a Display campaign can be judged by customers and not by clicks. If you're thinking about advertising, also read what to expect from Google Search ads.

Want to know whether the Display Network suits your business? Book a free call and we'll review it together.