ERP modules work together by combining different business functions into one system, allowing them to share data and automate processes across departments. Each module, like finance, HR, inventory management and CRM, is specialised in specific tasks but shares data with other modules through a central database. This makes sure everything is consistent, stops information from being stuck in one place, and gives people real-time insights for making decisions. For example, when an order is processed in the sales module, it can automatically update inventory levels and trigger accounting entries in the finance module. This makes workflows more efficient.