This article discusses one-to-one marketing, which involves customizing communications and offerings for each individual customer based on their preferences. While this approach sounds new, proprietors have long taken care of customers by remembering their details. However, mass production strategies replaced personalization. Now, educated consumers want individual treatment, competition is high, and technology enables detailed customer data collection and targeted communications. To implement one-to-one marketing, companies should differentiate customers by needs and values, identify prospects and customers, and understand each customer's wants and purchase behaviors. This personalized approach can foster loyalty and returns.