Enterprise resource planning (ERP) integrates external and internal management information across an entire organization, embracing financial accounting system, production, purchase, sales, inventory, and human resources management. ERP links all the departments across the corporation into a single centralized computer system. It is not so easy task to cover the entire company in a centralized computer system; however, ERP software unites various departments together into a single integrated system, so that the various departments can share information and communicate easily.