Cost Per Install (CPI) and Pay Per View (PPV) are two distinct online advertising models. CPI is primarily used in mobile app marketing, where advertisers pay each time a user installs their app through the ad. It focuses on driving conversions and is performance-based. In contrast, PPV charges advertisers when users view their ads, regardless of interaction or action taken. This model emphasizes visibility and brand awareness over direct results. CPI is typically more expensive but results-driven, while PPV offers broader exposure at a lower cost. Advertisers choose between them based on campaign goals—CPI for measurable installs and PPV for maximizing impressions and reach.