Stands for “Cost Per-Mile” CPM is a business standard for testing and selling ads on sites, advertising impressions. The AM’ is obtained from the Roman numeral for “thousand.” Sites that sell advertising can assure an advertiser a particular quantity of impressions set depending on that promise Examples the CPM rate.

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The hard disk was invented on September 13, 1956 by IBM team led by Rey Johnson (considered as “father” of the disk drive). Earlier hard disk drives were large and cumbersome devices.