Post-Merger Integration (PMI) refers to the process of combining two companies after a merger or acquisition to operate as a single unified organization. It focuses on aligning business processes, systems, people, and corporate cultures. Key activities include integrating IT systems, streamlining operations, restructuring teams, and harmonizing policies and workflows. Effective PMI helps realize expected synergies such as cost savings, improved efficiency, and increased market reach. It also involves managing communication, change management, and employee engagement to reduce disruption. Post-Merger Integration is critical for ensuring the success and long-term value of M&A transactions.