A geodatabase represents geographic features and attributes that are stored inside a Relational Database Management System (RDMS).
ESRI first introduced the geodatabase with the new generation of ArcInfo product - ArcGIS 8. Geodatabases are supported in all of the current ArcGIS desktop products - ArcReader, ArcView, ArcEditor, ArcInfo, and other on-line mapping platforms such as ArcIMS (Internet Map Server) and ArcExplorer.
There are two types of geodatabases - Personal and Enterprise. The personal geodatabase in fact is in the format of Microsoft ACCESS (.mdb); Enterprise geodatabases are hosted in server-based DBMS such as SQL Server, Oracle, or IBM DB2.
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