A SQL Server technology that supports the creation, management, and delivery of both traditional, paper-oriented reports and interactive, web-based reports.
Hi @beom0313
Report Definition (.rdl) Files
A report definition is a file that you create in Report Builder or Report Designer. Report definitions are written in XML that conforms to an XML grammar called Report Definition Language (RDL). RDL describes the XML elements, encompassing all possible variations that a report can assume.
Client Report Definition (.rdlc) Files
The Visual Studio Report Designer produces client report definition (.rdlc) files for use with the ReportViewer control. The .rdlc files can be converted to .rdl files for use with Reporting Services Report Designer.
For more details, you can refer to this document: Reports, Report Parts, and Report Definitions.
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Best regards,
Aniya