What is the definition of click-through attribution?

Click-through attribution measures conversions that occur after a user clicks on an ad. This model directly links an action (like a purchase or sign-up) to a prior ad click. It's a common and straightforward method for evaluating ad performance, as it directly demonstrates the ad's effectiveness in driving user engagement and subsequent actions. "When a user views your ad and takes action later" describes view-through attribution, which attributes conversions to ad impressions even without a click. "Every time a user sees your ad" simply describes an impression, not an attribution model.