Data engineers are tasked to move data from a source system to a destination system. For data to move between different systems, there should be a data integration tool that can effectively communicate with both the source and destination systems and ensure data is transferred between these systems. 

For small-scale projects where large volumes of data are not being processed, the communication between these systems can be through a network protocol like TCP or IP. For large-scale projects where the processing of huge volumes of data and scalability is paramount, communication can be through a message broker. 

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