Electronic Data Interchange (EDI) is the computer-to-computer exchange of business documents in a standard electronic format, like Gerber (RS-274-X), Excellon, ODB++, .CAM, DXF, .DWG,  .pcbdoc, and etc. in PCB manufacturing industry. Technical standards for EDI exist to facilitate parties transacting such instruments without having to make special arrangements.

Refer to History of EDI File Formats in PCB Industry