tell me how CPM advertising works?

[Riong Riong]

so if its $2 per impression, and i have 2,000 people going through my website daily, did i make $4000 in that day?
if its not correct, tell me how much i would make if 2000 people went to my site, and define impression

[Jake]

M is the roman numeral for 1000 that has traditionally been used in the printing industry, $2 CPM would pay you $0.002 per impression, typically there are somewhat more impressions than visitors (one person gets more than one page view)