What does Cost per Mille (CPM) measure in advertising?

Cost per Mille (CPM) specifically refers to the cost an advertiser pays for one thousand impressions of their advertisement. This metric is essential in the advertising industry as it helps evaluate the cost-effectiveness of ad campaigns, particularly in display advertising, where the primary goal is to generate visibility and reach a large audience.

By using CPM, advertisers can assess how much it costs to achieve significant visibility, allowing them to gauge the potential return on investment and compare various media costs effectively. This measurement focuses solely on impressions, rather than actions taken by viewers, such as clicks or engagements.

The other choices represent different aspects of advertising metrics but do not specifically define what CPM is. The total cost of a campaign refers to the overall expenditure and does not relate to impressions directly. Average cost per click deals with a different payment structure based on user interactions rather than just impressions. Lastly, total revenue earned per advertisement pertains to the revenue generated from an ad rather than its cost to the advertiser.