Files with the .GDB extension contain databases saved in a relational format that support full SQL language grammar, available for many machine platforms. The databases usually function in a client-server relation.

GDB databases are created using InterBase software and are unique to versions InterBase 7.0 and earlier – they have a size limit of 2TB. In later versions of the software, the GDB format was replaced by the .IB format due to its expanded functionality and the transfer of the development process from the company Borland to Embarcadero Technologies.