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 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. Lead generation is often paired with lead management to move leads through the purchase funnel. This combination of activities is referred to as pipeline marketing. A lead is usually allotted to an individual to follow up on. Once the individual (e.g. salesperson) reviews and qualifies it to have potential business, the lead gets converted to an opportunity for a business. The opportunity then has to undergo multiple sales stages before the deal is won. A lead usually is the contact information and in some cases, demographic information of a customer who is interested in a specific product or service. There are two types of leads in the lead generation market: sales leads and marketing leads. Online lead generation is an Internet marketing term that refers to the generation of prospective consumer interest or inquiry into a business' products or services through the Internet. Leads, also known as contacts, can be generated for a variety of purposes: list building, e-newsletter list acquisition, building out reward programs, loyalty programs or for other member acquisition programs. Email remains one of the main ways that businesses communicate with clients & vendors. Because of this, marketers often send messages to users’ inboxes. Many leads are generated every day with cold email campaigns and warm email campaigns. For the foreseeable future email campaigns remain a great email marketing tool. With the rise of social networking websites, social media is used by organizations and individuals to generate leads or gain business opportunities. Many companies actively participate on social networks including LinkedIn, Twitter and Facebook to find talent pools or market their new products and services.