This section is dedicated to host affiliate networks that allow publishers to generate revenue by supplying advertisers with specific actions they want mobile or desktop users to take, such as registering, purchasing a product or service, subscribing and more. CPA (stands for Cost / Commissions per Action) is essentially an umbrella type for a number of other types such as CPI and CPS. This is the most popular model among publishers because it offers a win-win relationships for advertisers and publishers. The former find this model the most attractive one, because with a catastrophic level of fraud that devastates CPC and CPM models, CPA provides a safer ground to work with. The latter have less headache as well, knowing that they deliver something advertisers are confident about its authenticity.