A modular ERP system is a type of software that helps businesses manage their resources. It lets businesses choose and use only the specific parts of the software that they need, instead of using all of it at once. Each module focuses on one business function, like finance, human resources, managing stock, or customer relationships. These modules work well together. This makes it easy for companies to adapt their system to their specific needs, add more as their business grows, and save money by avoiding unnecessary features.