CAN Bus Communciation

1. How can a Data frame has maximum of 130 bits? I do understand that its worst case with stuffing but how is that possible, logically its only possible to have 64bits per data frame?

2. What is the difference between PDUs and PIDs?

Thanks

While the payload of a dataframe is limited to 64 bits, there can be more bits than that "on the wire" in serial transport, due to protocol overhead and encoding (bitstuffing, etc).