The document discusses how to calculate eCPM (effective cost per mille, or cost per thousand impressions) for online marketing campaigns with CPC (cost per click) and CPA (cost per action) pricing models. It provides the formulas for determining total revenue, number of impression blocks, and dividing revenue by impressions to calculate eCPM. Examples are given using fictional campaign data to demonstrate how to apply the formulas. Key terms related to online advertising, affiliates, and metrics are also defined.