This document discusses customer relationship management (CRM) and e-CRM. It covers the key concepts of CRM including customer selection, acquisition, retention, and extension. E-CRM is defined as applying digital technologies like the web, email, and databases to acquire and retain customers through improving customer knowledge, targeting, and satisfaction. The benefits of e-CRM include more cost-effective targeting, mass customization, deeper relationships, and learning relationships. Different types of online buyers and differences between B2B and B2C buyers are also outlined. Finally, the document discusses assessing marketing communication effectiveness and types of CRM applications.