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CPM :
CPM Mean's Cost Per Mille ( Cost Per Thousand Impression Or Cost Per Thousand View ) It's Commonly Used In Url Shrinking Sites And Advertising Network's Including Banner Ads, Pop Ads And Direct Traffic.
CPC :
CPC Mean's Cost Per Click It's Used In AD Networks Like Adsense As You Get Paid For Placing Banner Ads On Your Site And For Each Click On The Banner's, Adsense Use Cpc Together With Cpm As When Clicks Go Up The Cpm Go Up Also But There Are Some Third Party Ad Network's That Use's CPC Alone But Not All Of Them.
CPA :
CPA Mean's Cost Per Action And It's Used In Affiliate Network's And CPA Network's Where You Get Paid For Each Specific Action You Bring Like A Purchase Or A Sign Up Or An Email Submit Or An App Install...
