CPA Course for Android
Traditionally, if you want to make money online affiliate marketing is one of the popular among many bloggers and internet marketers but you will only make money from affiliate marketing if someone buy the product you promote.
The thing with CPA is that you can make money online by just making your audience to take a specific action like filing a survey form or something even if you don't make a sale.
CPA means cost per action and if you don't have much information about it, inside this video is a good one to watch and to learn from.