Quite simply, an ad click is when someone clicks on an ad. Ad clicks are important when it comes to online marketing for several reasons.
What is a Good Click Through Rate? - PropellerAds Blog
What Happens When You Click On An Ad? [Infographic]
Quality Score: The Importance of Expected CTR, Ad Relevance, and
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Google Quality Score: How Quality Score Works with Google
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Mind Your Click-Through Rate (CTR) on Display Ads - PlugRush
Google Ads - Wikipedia