Also known as: Ad Views, Ad Impressions, Views
An impression is a single instance of an ad, banner, or link being displayed on a user's screen. It counts whether or not the ad is clicked, so it measures exposure at the very top of the marketing funnel.
Impressions are the denominator behind most upper-funnel math. Divide clicks by impressions and you get click-through rate (CTR); divide ad spend by impressions and multiply by 1,000 and you get CPM (cost per mille, the price of a thousand impressions). For an affiliate running a broker banner, impressions tell you how much reach you generated, while CTR tells you how compelling the creative and offer were.
Here is the arithmetic in practice: a broker banner served 10,000 impressions with 10 clicks is a 0.10% CTR — weak. Swap the creative to lead with a specific hook, say a "$0 commission" or "no-deposit demo" angle, and lift CTR to 2%, and the same 10,000 impressions now produce 200 clicks. The reach did not change; the message did.
Be careful not to confuse impressions with reach. Impressions count every display, so one user who sees your banner ten times generates ten impressions but a reach of one unique person. Ad platforms also distinguish "served" impressions from "viewable" impressions — the industry viewability standard (MRC/IAB) counts a display banner as viewable only when at least 50% of its pixels are on screen for one continuous second.
An impression is logged when the ad server or tracking pixel registers that the creative was requested and rendered on a page or feed. On banner networks this fires as the image loads; on social platforms it fires when the ad enters the viewport.
Because a raw served count can include ads that never actually appeared on screen, platforms increasingly report viewable impressions, which apply the MRC/IAB threshold of 50% of pixels visible for at least one second (two seconds for video). Partners buying on a CPM basis should confirm whether they are paying for served or viewable impressions, since the gap can be 30% or more on cheap inventory.
Why it matters for partnership: Impressions are the top of your funnel and the denominator for CTR. Tracking them shows whether a broker banner is being seen but ignored — high impressions with low CTR means the creative or offer needs to change, not the placement.
You run a banner for IC Markets across a finance blog network and log 500,000 impressions in a month at a $2 CPM, spending $1,000. It drives 2,500 clicks — a 0.5% CTR — and 25 of those become funded accounts. That lets you compute a true cost per acquisition of $40 and decide whether the placement is worth renewing.
| Metric | What it counts | Funnel stage |
|---|---|---|
| Impressions | Every time the ad is displayed | Exposure |
| Reach | Unique people who saw it | Exposure |
| Clicks | Interactions with the ad | Engagement |
Don't buy on CPM unless your goal is pure brand awareness; for performance campaigns push for CPC or CPA so you only pay when traffic actually engages or converts.
Treating impressions as reach, which overstates your true audience size — one user seeing a banner ten times is ten impressions but only one person reached.
Impressions count every time an ad is shown, including repeats to the same person. Reach counts only the unique people who saw it, so reach is always equal to or lower than impressions.
Display banner CTR is typically well under 1%, often 0.05–0.5%. Search and native placements run higher. Judge CTR against your own past creatives and the placement rather than a universal benchmark.
A served impression means the ad was delivered; a viewable impression means it actually appeared on screen per the MRC/IAB standard of 50% of pixels for at least one second. You can be charged for served but only benefit from viewable.
CPM (per impression) suits brand awareness; CPC or CPA suits performance and protects your ROI because you pay for engagement or conversions, not mere exposure.
On display networks an impression usually fires when the creative loads; on social feeds it fires when the ad enters the viewport. Always check the platform's definition before comparing counts across channels.
Yes. On CPM buys you pay directly per thousand impressions, and on auction platforms high impression volume with low CTR can raise your effective cost per click as the algorithm deprioritizes the ad.