This document provides an introduction to IT change management based on ITIL best practices. It defines change as the addition, modification, or removal of anything that could affect IT services. The main purposes of change management are to maximize the number of successful changes by properly assessing risks, authorizing approved changes, and managing change schedules. It describes different types of changes and the roles and responsibilities involved in the change management process. It also provides examples of documentation used such as change request tickets, test plans and results, and post-implementation reviews. Finally, it discusses some common challenges faced with change management.