Data Source is the initial source of data sets that contain tables and fields for further analysis. Generally it can be defined as a number of data that user selects for export to Power BI.
Each data source can contain different data based on your exporting requirements and the data you need in Power BI to build a certain report.
You can create as many Data Sources as you need. Their number is not limited by the app.
All the data sources created by a certain user with Power BI Connector for Jira will be shown on My data sources tab in the application.
Each data source has a name, the owner and other attributes. Each data source has a separate URL.