Many marketing agencies offer lead generation services for business that don't wish to develop their own systems. These agencies will often have a network of companies and websites that it uses to promote its client businesses. When a visitor expresses interest in one of the agency's clients, the agency passes that lead back to the client. Often agencies will promote their clients through a directory or list of providers, and when a visitor requests a quote for a specific service, the agency alerts the appropriate client.
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.