CPM:

[sosi]

Cost per Thousand Impressions. A paid search engine advertising term meaning how much you would pay for 1,000 impressions of an ad. Once a common way of purchasing advertising online, now most online advertising is paid by clicks, rather than by impressions.

 

[veenu]

Cost per impression, often abbreviated to CPI, is a term used in online advertising and marketing related to web traffic.It refers to the cost of internet marketing or email advertising campaigns where advertisers pay for every time an ad is displayed.