Banner ads exist for two reasons. Sometimes they want you to click. Sometimes they just want you to remember them.

The first outcome is straightforward. A visitor lands on a publisher site. They see an image. They click. They end up on the advertiser’s page. That is a direct hit. Success looks even better if that visitor buys something immediately. Advertisers love that. It is revenue.

But not every click happens.

That leaves the second objective. Branding. This is the slow burn. You see an ad for a specific brand of glue on a streaming service. You don’t buy glue. You aren’t even looking for glue. But later, when you are standing in the aisle holding two different bottles, your brain reaches for the name it recognizes. You pick Brand X. Not because it is better, but because it is familiar. That is the power of repeated exposure.

Because these goals differ, the metrics differ. Advertisers don’t just guess. They track. Here is what the numbers actually mean.

Clicks and Cost-Per-Click

The most direct metric is the click-through. This measures how many people actually interacted with the banner. If a user clicks the ad to go to the advertiser’s site, that counts.

Publisher sites often sell this space on a cost-per-click (CPC) basis. The publisher gets paid every time someone clicks. It aligns their incentive with the advertiser’s. The publisher wants you to click. The advertiser wants you to visit.

Page Views and CPM

What if no one clicks? The ad still did work. It was seen.

This is measured in page views, also called impressions. An impression is simply a request for a web page from the server. If a banner is on that page, the user was exposed to it. They might have ignored it. They might have scrolled past it. But it was there.

Advertisers use this data to understand reach. High impression counts mean high visibility. This is why the standard pricing model is CPM (cost per mille). Mille is Latin for a thousand. Advertisers pay a set price for every 1,000 times the ad is shown. It doesn’t matter if anyone clicks. Payment is for visibility alone.

Click-Through Rate (CTR)

How do you know if an ad is performing well relative to its exposure? You look at the ratio.

Click-through rate (CTR) compares total page views to total clicks. It is a percentage. The typical CTR is less than one percent. A one percent CTR is common. Anything significantly higher is rare. If your CTR is low, it doesn’t mean the ad failed. It means most people are ignoring it. That is normal behavior.

Tracking the Sale

Clicks and impressions are easy to count. Sales are harder to tie back to a specific banner.

Advertisers calculate cost per sale by tracking the entire journey. Many use Internet cookies. These small data packets allow a site to combine a visitor’s shopping history with information about how they arrived. Did they come from a banner? Did they buy a shirt? The cookie links the two events.

Not all advertisers track this the same way. Some rely on unique URLs. Some use user accounts. But the goal is the same. Figure out how much ad spend it took to make one sale.

Why It Matters

Most advertisers look at all these numbers together. They don’t pick one. They weigh them.

A branding campaign might have a low CTR but high impressions. That is acceptable. The goal was awareness, not immediate action. A direct-response campaign needs a higher CTR. The goal is the click.

Understanding these distinctions helps you see past the noise. The next time you ignore an ad, remember: the advertiser might still be winning. They just paid for your attention, not your purchase.

You scroll past. The page loads. The cycle continues.