I am using adsense as well as ad brite what is the meaning of these CPC/CPM/CPA/CPL also which one is best and how they calculate and work and give money??

CPC = Cost per Click
CPM = Cost Per Thousand
CPA = Cost Per Actions
CPL = Cost Per Lead

CPC = for every click you will earn $
CPM = you will earn $ per 1000 impression
CPA = you will earn $ for every action like singing up
CPL = refer to the cost and the payments made for each qualifying lead. For example, when a web site visitor submits their e-mail address, or registers for a particular offer by providing their contact information and perhaps even by completing a survey by submitting demographic information, these actions result in a lead.

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