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Wikipedia as of  2018 when added to this website. 

 

A lead is usually the contact information and, in some cases, demographic information of a customer who is interested in a specific product or service.                                

 

Marketing Qualified Leads  (MQLs)  are leads that have typically come through Inbound channels, such as Web Search or content marketing  and have expressed interest in a company's product or service. These leads have yet to interact with sales teams. 

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Business leads are specific leads generated for a unique advertiser offer. In direct contrast to sales leads.

 

Sales Qualified Leads (SQLs) are leads screened by salespeople, oftentimes Sales Development Representatives (SDRs), for appropriate qualifying criteria to be followed-up with. Qualifying criteria include need, budget, capacity, time frame, interest, or authority to purchase.

Sales leads are generated on the basis of demographic criteria such as FICO score (United States), income, age, household income, psycho graphic, etc. These leads are resold to multiple advertisers. Sales leads are typically followed up through phone calls by the sales force. Sales leads are commonly found in the mortgage, insurance and finance industries.