CPE

An online advertising payment model which attempts to measure the value of a user's engagement with a company's brand. Similar to CPM, where a publisher is paid for a certain number of page impressions, CPE is a brand awareness advertising model that was developed in response to video and mobile advertising. The theory is that users are spending time looking at your video or mobile ad for a longer amount of time than if it were just impression based, and that there is a value to that, even though they may not make a purchase or take an action.

Engagement mapping specifically refers to a method of tracking online advertising initiatives for all user actions before making online purchases.