Cost per lead (CPL) is a pricing system frequently used in online advertising. In this model, the advertiser is charged for each lead generated by their advertising campaigns. A lead corresponds to a specific action taken by a user, such as registering on a website, subscribing to a newsletter, or requesting more information about a product or service. This approach allows businesses to directly evaluate the effectiveness of their online advertising campaigns based on the number of qualified leads obtained. By opting for CPL, advertisers can optimize their advertising budgets by only paying prospects who have shown genuine interest in their offer. This practice helps improve return on investment (ROI) and refine the precision of their marketing strategies.