CPM means Cost per Mille, and it submit the cost for 1,000 impressions.
CPM advertising networks work attractive and most effective, greatly as PPC networks, but you get paid on the basis of number of impressions (i.e., total page views) generated by the ads showed on your blog/website.
Displaying an Advertising banner with a $1 CPM, on a blog/Website which generates 100,000 page views monthly will earn $100 monthly.
The cost per mille differs with the network, on basis of the way of ad behavior format position.
A good Ad network makes you higher CPM rate (which displays more ads of advertisers).
Putting Ad to the top of the blog/website page and a superior (in pixels) makes you higher CPM.
According to your blog/website traffic you get minimum of $0 to $10 and best payout per $10 per 1,000 impressions.
This CPM advertising makes you better earnings on relevant traffic page views and most of the visitor ratio, works better on sites which are online forum, new magazines etc.
Here MoneyTariff provides few popular CPM Advertising networks as below:
