When an MQL displays sales-ready behavior, like requesting for a demo or signing up for a free trial, they become a sales qualified lead. These leads are usually handed over by the sales team to an Account Executive (AE). SQLs are close to making a purchasing decision, so the quicker the AE acts, the higher their chances of conversion. A good way to identify an SQL is by applying the BANT framework—do they have the Budget, Authority, Need and Timeframe to buy from you?
Online surveys: Consumers are asked to complete a survey, including their demographic information and product and lifestyle interests. This information is used as a sales lead for advertisers, who purchase the consumer's information if provided. The consumer may 'opt-in' to receive correspondence from the advertiser and is therefore considered a qualified lead.