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Interoperability is essential in systems where multiple applications need to share data or functions. This is because interoperability ensures that disparate systems can work together seamlessly, allowing for better integration, communication, and functionality across various applications. When different software applications can exchange information and use each other’s capabilities, it leads to enhanced efficiency, reduced data silos, and improved workflow.

For instance, in an environment with various software tools, such as a CRM (Customer Relationship Management) system that needs to communicate with an ERP (Enterprise Resource Planning) system, interoperability becomes crucial. Without it, organizations would struggle to achieve a cohesive operational flow, leading to data inconsistencies and potential bottlenecks.

In contrast, while it is true that software must work on various operating platforms, this relates more specifically to compatibility rather than interoperability. The aspect of user training is more about usability and user experience rather than the ability of systems to work collaboratively. Finally, a single application being utilized does not present a need for interoperability as there are no other systems to interact with. Thus, the requirement for multiple applications to share data or functions distinctly highlights the importance of interoperability in modern software ecosystems.