This document provides an overview of the past, present, and future of customer relationship management (CRM). It discusses the evolution of CRM from the eras of mass marketing and segmentation in the 1960s-1980s to the rise of relationship marketing and call centers in the 1990s. The present section outlines common CRM practices like promotion campaigns and feedback services. Looking ahead, the future of CRM is predicted to involve increased retention and sales, reduced costs, a significant technological role, and a focus on customer individuality and information in a globalized marketplace.