What triggers an advertiser's charge in a Cost-per-install campaign?

In a Cost-per-install (CPI) campaign, the advertiser is charged specifically when a user successfully installs the application being promoted. This model is focused on driving actual installs, making it a performance-based advertising strategy that aligns the advertiser's costs directly with their goal of acquiring new users.

The other potential triggers, such as every view of the ad, every click on the ad, or every user engagement with the ad, do not lead to charges in this particular type of campaign. Instead, these actions may be associated with different pricing models, such as Cost-per-impression (CPI) for views or Cost-per-click (CPC) for clicks. In the context of a CPI campaign, the install is the key metric that determines the charge, ensuring that the advertiser only pays when the desired action, which is the installation of the app, has occurred. This makes CPI campaigns a popular choice for advertisers looking for measurable results in terms of user acquisition.