The OBD2 DBC file contains conversion rules for decoding raw OBD2 data to human-readable form (km/h, %, ...).
DBC is the standard CAN database format used in most CAN tools - incl. our CANedge software/APIs.
This OBD2 DBC contains ~150 of the standard Mode 01 PIDs - and you can easily extend it with e.g. proprietary PIDs.