CPM and CPI are acronyms that are often used in advertising and marketing. CPM stands for Cost Per Mille (or Cost Per Thousand), and is a measure of the cost of an advertising campaign. It is calculated by dividing the total cost of the campaign by the number of impressions, or views, that it received, and then multiplying by 1,000. For example, if an advertising campaign cost $500 and received 50,000 impressions, its CPM would be $10 ($500 / 50,000 * 1,000 = $10).

CPI, on the other hand, stands for Cost Per Impression, and is a measure of the cost of a single impression. It is calculated by dividing the total cost of the campaign by the number of impressions it received. For example, if an advertising campaign cost $500 and received 50,000 impressions, its CPI would be $0.01 ($500 / 50,000 = $0.01).

‍