DDB is a file extension native to Pro Tools, a music workstation available for Windows and Mac OS. DDB is a proprietary format owned by Avid. DDB is a support file that stores various data related to given audio project.

Pro Tools program used many DDB files, which along with WFM files constitute a project database. Working on multiple projects simultaneously may requires creating manual copy of entire ‘Databases’ folder as a precaution in case any user interface problems should occur.