CMP, or cost-per-thousand, is a metric used in advertising to measure the cost of reaching one thousand potential customers or viewers. It is calculated by dividing the total cost of an advertising campaign by the number of impressions, or views, it receives and then multiplying by one thousand. This allows advertisers to compare the effectiveness and efficiency of different advertising methods and platforms. CMP is an important tool in the world of marketing, helping businesses make informed decisions about their advertising strategies and budget allocation.