The primary function of an enterprise resource planning (ERP) system is to integrate and streamline core business processes across various departments. ERP systems combine financial, HR, supply chain, customer relationship management, and other functions into a unified system, facilitating data sharing and communication among departments. This integration improves operational efficiency, enhances data accuracy, and provides valuable insights for decision-making. By centralizing data and processes, ERP systems help organizations optimize their resources, reduce operational costs, and respond more effectively to market changes and customer needs.