differene between CPM and PPC

[darksorrow]

CPM is cost per thousand impression and cpc is cost per click in cpm you will get paid when you get 1000 impression of ads and cpc is when any ad will be clicked you will be paid.

Thanks for your explanation. I wonder how come "M" then instead of I, it should have been "CPI" right? not "CPM". I'm just confused.

Here M is used for Metric. Which means 1000 in Greek (not sure). From there the M came from and used as Cost Per Metric.