$7 CPM means that for every 1,000 times an advertisement is displayed online, the advertiser would be charged $7. This metric, also known as cost per thousand (CPM), is used to determine the price of advertising impressions. It is a way for advertisers to gauge the cost effectiveness of their campaigns by calculating the average cost for reaching a thousand viewers. So, if an advertiser agrees to a $7 CPM, they would pay $7.00 for every 1,000 impressions of their advertisement.