CPA, CPC,CPM, CPS

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There are three main ways of generating revenue with ads. They are CPA, CPC, and CPM. Below is a brief explanation of each.

CPA means cost per action/acquisition. You get paid whenever a visitor you your page does something such as make a purchase.
CPC means cost per click. This means that the cost of the ad is decided by the amount of clicks. You get paid whenever an ad is clicked.
CPM means cost per millennium. This means that the cost is decided by the impression. You get paid whenever the ad gets shown.

CPS means cost per sale. Pricing based on the number of sales transactions your ad generates. Since users may visit your site several times before making a purchase.