A qualified lead refers to a prospective customer who has shown interest in a product or service and meets specific criteria that make them likely to convert into a paying customer. There are two types: Marketing Qualified Leads (MQL) and Sales Qualified Leads (SQL). An MQL has engaged with marketing efforts (such as filling out forms or downloading content). On the other hand, an SQL is ready to interact with the sales team. Businesses use lead qualification to focus efforts on high-potential customers. Through this, they optimize resources and improve conversion rates.