A whitelist is a list of good quality ad networks and publishers created by mobile advertisers to allow the listed sources to run their user acquisition campaigns. Adding a source to a whitelist means being sure that it has quality traffic and can run an advertiser’s ad campaigns. 

Blacklisting and whitelisting are important operations for mobile advertisers to find out the most quality sources and to avoid fraudulent sources. While advertisers suspend bad quality and fraudulent publishers in blacklisting, high quality sources are marked and allowed to run campaigns on whitelisting.