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The Cost per Action advertising campaign, which is also referred to as "Pay per Action" (PPA), is a popular online advertising model in which each action (whether it is a purchase or any other form of submission) is rewarded once it is linked to the advertisement. CPA campaigns are preferred by advertisers since payment is dependent on the completion of the desired action. An action could be any type of purchase or even a questionnaire being filled in.  

The Cost per Action advertising campaign, which is also referred to as "Pay per Action" (PPA), is a popular online advertising model in which each action (whether it is a purchase or any other form of submission) is rewarded once it is linked to the advertisement. CPA campaigns are preferred by advertisers since payment is dependent on the completion of the desired action. An action could be any type of purchase or even a questionnaire being filled in.  

CPA is the opposite process and type of program as compared to cost-per-impressions model ([[CPM]]), while the cost-per-click ([[CPC]]) model is somehow between these types of advertising payment models. Even if the CPA programs are highly popular these days, risks are also involved because the commission are dependent on great conversion rates from the advertiser's website. There are plenty of differences between these three popular online advertising campaign models, but also some similarities such as their main goal and purpose: to attract more customers, increase customer's awareness and earn money form online businesses. <ref>[http://www.marketingterms.com/dictionary/cost_per_action/ CPA, CPM and CPC]</ref>

CPA is the opposite type of program as the cost-per-impressions model ([[CPM]]), while the cost-per-click ([[CPC]]) model is between these types of advertising payment models. While the CPA programs are popular, risks are also involved because commission is dependent on great conversion rates from the advertiser's website. <ref>[http://www.marketingterms.com/dictionary/cost_per_action/ CPA, CPM and CPC]</ref>

==Types of CPA programs==

==Types of CPA programs==