Marketing a mobile app is crucial for its success, especially given the intense competition with over five million apps available on major app stores. The global spend on app marketing is projected to surpass $90 billion, highlighting the importance of reaching the right audience. Cost Per Install (CPI) networks, a popular model among mobile app marketers, play a significant role by charging advertisers only when users install the app, enhancing the efficiency of user acquisition efforts. These networks, such as Adcash, Adikteev, and AppLovin, offer advanced targeting and real-time optimization to ensure effective campaigns. Each platform provides unique features, such as Adikteev's focus on retargeting inactive users and AppLovin's use of AI for centralized ad mediation, ensuring cost-effective user growth. The summary of various CPI networks and their offerings emphasizes the importance of ongoing campaign monitoring and optimization to not only acquire installations but also ensure user engagement and retention, leveraging platforms like Luciq for performance tracking and user behavior analysis.