It depends on the network. Basically, ad networks are intermediaries between ad publishers (the app owners/developers) and advertisers (usually ad agencies, but also for example app owners or brands).
The advertiser will "buy traffic" from the ad network in a given region, and the network will rely on the publishers that have signed up to display the ads to provide this traffic.
Advertisers and networks will apply different payment models, such as CPI (cost per install), CPM (cost per impression), CPC (per click). At AdBuddiz, we display CPI and CPM campaigns.
We distinguish ourselves from other networks by displaying only high quality, premium full-screen ads.
Hope that helps
The advertiser will "buy traffic" from the ad network in a given region, and the network will rely on the publishers that have signed up to display the ads to provide this traffic.
Advertisers and networks will apply different payment models, such as CPI (cost per install), CPM (cost per impression), CPC (per click). At AdBuddiz, we display CPI and CPM campaigns.
We distinguish ourselves from other networks by displaying only high quality, premium full-screen ads.
Hope that helps