Explanation:

Data synchronization is the effort to ensure that, once data leaves a system or storage entity, it does not fall out of harmony with its source, thereby creating inconsistency in the data record.
Often the very purpose of an application is to modify and update data. But when data is modified in an application, you must take care that those changes are communicated back to other systems that use that data. Data synchronization provides a means of creating harmony and consistency among all the systems that have access to data.