The on-line advertising world has its own distinct nomenclature.
Advertising Concepts
CPM
An advertiser is a person or company who wants to display advertising on your (or some other) website via your Revive Adserver installation. Each advertisers will have one or more campaigns.
CPC
A campaign is set of related advertisements that an advertiser wants to display. Campaigns allow shared details, such as the dates to start and stop showing the ads, and the frequency with the ads are displayed, to be managed in a consistent way across the related ads (called banners in Revive Adserver). Each campaign that an advertiser has will have one or more banners.
CPA
A banner is the content (called a creative in Revive Adserver) and the associated properties that make up an on-line advertisement. A banner is what the visitors to a website will see displayed to then as the "ad", and be able to click on or interact with in some way. A banner's creative can be a static image, some HTML code, a Flash banner, text or a video ad.