R/3 Repository Information System

Information tool that stores details about all development objects in the R/3 system and their relationships. the user interface of the R/3 repository information system resembles a file manager where objects are grouped together in object categories within a hierarchical structure. in the R/3 repository information system, you can: Generate lists of programs, tables, fields, data elements, and domains. also, determine where certain tables and fields are used on screens and in ABAP programs, and display foreign key dependencies.

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The separation line is described in the SAP standard documentation.
Below the separation line is my translation
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An information tool that stores all development objects in the R/3 system and detailed information about their relationships. R/3 the user interface of the knowledge base information system is similar to a file manager. objects are grouped by object type in hierarchical structure. In the R/3 knowledge base information system, you can: generateProgramList of tables, fields, data elements, and fields. In addition, you can determine whether a specific table and field are used on the screen and in the ABAP program, and whether the foreign key dependency is displayed.