O CPA is a metric advertising that indicates the cost of a conversion specific.
Unlike CPC (Cost Per Click) which refers to the cost per individual click, the CPA reveals how much it costs the company to achieve a desired action, such as a sale, subscription or download.
Campaigns based on CPA are often used when the objective is clearly to conversion.
Want an example? You know when you're using an app and you see an ad for a game to download? That company is certainly looking at CPA of that campaign to find out how much each download is costing.
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