Use the Report Data pane to view the currently defined parameters, data sources, datasets, field collections, and images in your report. The Report Dane displays a hierarchical view of the items that represent data in your report. The top level nodes represent built-in fields, parameters, images, and data source references. Expand each node to view the data items. For example, when you expand a data source node, the datasets defined for that data source appear. When you expand a dataset, its field collection appears. Drag items to the report design surface to link data with report items on the report page.
Represents a single data source reference to an embedded data source or to a shared data source. In SQL Server Data Tools (SSDT), shared data sources appear in Solution Explorer under the Shared Data Sources folder. A data source specifies one of the data source types supported by Reporting Services. A data source is the parent node for the collection of datasets based on it. For more information, see Data Connections, Data Sources, and Connection Strings (SSRS)