CAM
ODB++
In plain English
One smart file that packs the layer pictures, the wiring list, and the parts info all together — like a single project folder instead of a pile of loose printouts.
The technical version
ODB++ is a hierarchical, intelligent manufacturing data format that stores copper layers, drill, netlist, stackup, and component data in a single structured database. Unlike Gerber, it preserves the relationships between geometry and electrical intent, reducing ambiguity in CAM. It is one of the most widely accepted intelligent formats across fabricators.