what does cpm mean in youtube 
cpm is the average cost per mille 1 000 advertising impressions so on youtube your cpm is how much you pay for 1 000 viewers to see your ad the bottom linecost per mille or cost per thousand is the average cost for achieving 1 000 advertisement impressions regardless of the medium used it is one of the figures used to charge advertisers for web ad pricing as well as a metric used by companies to determine how successful and costly a marketing was or is 