Recently,[when?] there has been a rapid increase in online lead generation: banner and direct response advertising that works off a CPL pricing model. In a pay-per-acquisition (PPA) pricing model, advertisers pay only for qualified leads resulting from those actions, irrespective of the clicks or impressions that went into generating the lead. PPA advertising is playing an active role in online lead generation.
In marketing, lead generation is the initiation of consumer interest or enquiry into products or services of a business. Leads can be created for purposes such as list building, e-newsletter list acquisition or for sales leads. The methods for generating leads typically fall under the umbrella of advertising, but may also include non-paid sources such as organic search engine results or referrals from existing customers.