How is cost per lead (CPL) defined in advertising?

Cost per lead (CPL) is specifically defined as a metric that measures the expense incurred to acquire a lead through advertising efforts. In this context, a lead typically refers to a potential customer who has demonstrated interest in a product or service, often by providing their contact information or engaging with a brand in some meaningful way.

CPL is a crucial measurement as it allows advertisers to evaluate the efficiency and effectiveness of their campaigns in generating leads. By analyzing this cost, businesses can assess how much they are spending to attract potential customers and can adjust their strategies accordingly to maximize return on investment.

The other options address different aspects of advertising metrics but do not align with the true nature of CPL. For instance, one option pertains to overall campaign engagement, while another focuses on the cost of clicks rather than leads specifically. Additionally, one choice discusses revenue generated per advertisement, which relates to profitability rather than the cost of acquiring leads. Thus, option C accurately captures the definition of Cost per Lead in the advertising industry.