Change management involves creating and implementing roles, processes, and tools to effectively manage how people are affected by organizational changes. It requires involvement from various groups like the project team, senior leaders, managers, and employees. There are different levels and phases of change management. The ADKAR model is a foundational tool that identifies key components for managing change, including creating awareness of the need for change, developing a desire to support it, providing knowledge and ability to implement changes, and reinforcing changes.