PPC (PAY PER CLICK)

Pay per click is part of the affiliate (about the meaning of the affiliate, click here) which means pay per click advertising is a method of cooperation on the internet where the webmaster or site owner will be paid for every site visitor clicks on advertising links inserted in his blog or website . In general, the PPC program (Pay Per Click) suggests a blog or website by using the English language. Now there are so many programs that exist in the world of PPC Online.
Glossary terms related to PPC (Pay Per Click):

Page Impressions
Page Impressions is the number that shows how many times a page that contains the Ad Units opened by visitors. Its value is not affected by the existing quantity of Ad Units in the relevant pages.

Clicks
Clicks is the number of clicks on Ad Units owned by publisher. In the AdSense report pages, publishers can view the total clicks that he can get, and based on Ad Units or patterns.

CTR (clickthrough rate)
CTR is the ratio in percent between the number of clicks received by an Ad Units by Units is the number of display ad. For example, an Ad Units are displayed 40 times and clicked 10 times has a CTR of 25% (10:40).

CPC (Cost Per Click)
The CPC is the amount of money that would be obtained by the publisher when a particular Ad Units clicked. The CPC value of each Ad Units vary and are determined by many factors, including the performance and quality of the site's publisher. But in general, the maximum value possible is 20% of the value of dynamic bids offered by the advertiser.

eCPM (Effective CPM)
eCPM or CPM (Cost Per Million) is the result of the division between the total revenue pages publisher with a number of impressions (per 1000) which he got from advertisements. For example, publishers who produce 50 000 to USD 200 from impressi will have the CPM value of USD 4 (USD 200 divided by 50).

Source: http://index-money.blogspot.com/2010/05/ppc-pay-per-click.html