CPC este un sistem de contorizare a sumei de plata. Reprezinta o forma de contorizare a activitatii unui publisher vis-a-vis de furnizorii de reclame carora le-a oferit serviciile sale. Definitia data de site-ul www.wikipedia.com este urmatoarea:"Cost per click (CPC) is the amount of money an advertiser pays search engines and other Internet publishers for a single click on its advertisement that brings one visitor to its website.Cost per click (CPC) varies depending on the search engine and the level of competition for a particular keyword."(sursa/source:http://en.wikipedia.org/wiki/Cost_per_click).

CPM este un alt sistem de contorizare a sumei de plata. Reprezinta o forma de contorizare a activitatii unui publisher vis-a-vis de furnizorii de reclame carora le-a oferit serviciile sale. Definitia data de site-ul www.wikipedia.com este urmatoarea:"Cost per mille (CPM), also called cost ‰ and cost per thousand (CPT) (in Latin mille means thousand) , is a commonly used measurement in advertising. Radio, television, newspaper, magazine, out-of-home advertising, and online advertising can be purchased on the basis of what it costs to show the ad to one thousand viewers (CPM). It is used in marketing as a benchmark to calculate the relative cost of an advertising campaign or an ad message in a given medium. Rather than an absolute cost, CPM estimates the cost per 1000 views of the ad." (sursa/source:http://en.wikipedia.org/wiki/Cost_per_mille).