What does 1394 header and USB header mean?

1394 header and USB header meaning in Computer Science Dictionary

The 1394 header and USB header is a pin connection entirely on a computer motherboard that enable additional 1394 and USB contacts is included with the pc. For example, if you wished to add extra USB contacts towards front side of one's computer system a USB add-on could be included into among the drive bays and attached to the USB header. The picture reveals a typical example of exactly what the 1394 and USB headers appear to be on a computer motherboard.