CPM
cost per thousand
With CPM pricing, advertisers pay a fixed price per thousand impressions.  CPM pricing is best used for branding and brand awareness.
CPC
cost per click
With CPC pricing, advertisers pay when a user clicks on the ad.  There is a moderate amount of CPC priced inventory available.
CPA & CPL
cost per action, acquisition or lead
With CPA and CPL pricing types, advertisers pay a per-conversion (acquisition) price only when the user converts on the ad.
RTB
Real-Time Bidding
Real-Time Bidding makes it possible for advertisers to vary their CPM bid for a single impression based on the potential for the impression to meet the advertisers performance goals. Advertisers pay more for high value impressions and less for low value impressions. Adgile’s RTB algorithm predicts the probable response to an ad, calculates a bid price tied to the value, and then measures the performance compared to an advertiser’s goals. This ensures true price efficiency.