Marketing lists are lists of accounts Companies that might do business with your organization., contacts People who represent customers or potential customers, or individuals related to accounts. For example, an individual who purchases products or services for their own use, or an employee of an account. A contact may also be a person involved in a business transaction, such as a supplier or a colleague., or leads Potential customers who must be qualified or disqualified as sales opportunities. If a lead is qualified, it can be converted to an opportunity, account, and/or contact. that match a specific set of criteria.