Mobile ad networks are platforms where app developers or publishers, can sell ad space and marketers or advertisers, can buy ad space. For monetizing an app by selling ad space or increasing user acquisition by purchasing ad space, registering to a mobile ad network becomes essential. Mobile ad networks offer platforms for app developers who are aiming to monetize or expand their apps. These networks are a primary buying and selling marketplace for media spaces. App developers profit from buying mobile ad spots as the target audience is already on mobile. So ad viewers do not have to switch mediums to install a new app. There are various types of mobile ad networks which ensure fair rates, high eCPMS, targeted audience, quality ad graphics. Mobile Ad formats can be the banner, video, interstitial or rewarded video ads. Mobile ad networks are available for both publishers to monetize their app and advertisers to improve user acquisition. An app’s niche significantly affects the ad formats that will work well and be non-intrusive to the app users. So, choosing the perfect mobile ad network will depend on several factors such as different types of advertising demand, ad units, setups and might serve different app verticals.