DDP is developer file used b Delphi development environments. DDP files can be edited using diagram editor available in Delphi 6 Iliad (released in 2001) or later. Diagram editor tool is also present in Delphi 7 Aurora package that was released in 2002.

DDP files store data that depicts dependencies and relations between various elements of given software product and are used to give programmers more clear and succint picture of developed components. DDP files are nothing more than support files used during software development process.