For connecting camcorders to your PC you have to use Firewire as this is kinda a persisting standard. Though when you look into the camcorder's specs you will rarely see a "Firewire" but "disguise names" like "DV (In / Out)" oder "i.Link" which is what Sony tends to call it. But in the end it's all just Firewire...

Camcorders today also have USB-Ports but that's more or less just for interaction with the flash memory you can insert and save photos or small MPEG Videos on or even use it as a webcam...

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