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What is SSRS?
SQL Server Reporting Services (SSRS) is Microsoft's reporting platform. It allows users to design reports with data sets tied to different data sources (e.g. SQL data bases, SharePoint lists). This is done with a type of XML file: RDL (Report Definition Language). SSRS RDL files can be exported to different file formats using the Reporting Services rendering extensions (Excel, Word, PDF, HTML etc.)
The RDL contains information about the data sources, data sets, queries, connection strings and more. It also contains information about the look and feel of the report. Reports are typically designed in Visual Studio or with Report Builder.
For more information about SSRS, please refer to this article.
What is the OfficeWRiter SSRS Integration?
OfficeWriter fits in with SSRS on two fronts: