The document discusses the elements that would be included in a customer database, such as names, contact information, demographics, preferences, and transaction history. It outlines potential sources for populating the database, like customer interactions, salespeople, and public records. Maintaining a customer database provides several advantages like increased sales, customization, and insights to inform business decisions. It also discusses the relevance of a customer database for a business-to-consumer market, such as segmenting customers, measuring promotions, and notifying customers of new products or offers.