How does CPM work?

[Masterguns]

How does CPM work? Price wise.

if the ad costed 20$ to post on a website and the impressions were 520,000?

[Jordan]

CPM = cost per 1,000 impressions.

So for 520,000 impressions at $20 the price per CPM is is ~ $0.038

[Masterguns]

what is an impression?

[Jordan]

An impression is just your banner or link shown. 1 Impression means that your banner/link was displayed to 1 visitor.

[kisna]

So basically, the more visitor on your site, the more impression right? Then I think CPM is best for the big sites rather than CPC.

[TcM]

Do you know any good ones? Ones that offer a good price per CPM? I have a website generating more than 1000 uniques/ day and I would love to make some money from this method.