You can use REST APIs to gather data from tables in Reports and use that data in other applications or reports.
The easiest method to obtain the data set ID for a report table is to copy it using the REST API option in the Reports application on the Web Console. Although you can retrieve a data set ID for an entire report using a separate REST API, the data that is contained in the response often contains multiple data sets that you would then have to search through to find the single set of data that you want to use.