FireWire
From Applepedia
FireWire is Apple's trade name for the IEEE 1394 serial interface. It features 400 Mbit/s speeds in the original, and 800Mbit/s in the FireWire 800 version.
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Usage
FireWire is primarily used for external hard drives and other storage, as well as digital video transfer between a DV camcorder and a computer (or between two camcorders).
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FireWire 800
FireWire 800 is just what you think it is, an 800Mbit/s FireWire standard. It uses a strangely-shaped 12-pin connector. With an adapter, the FireWire 800 connector is backwards-compatible to the six-pin FireWire 400 connector.
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FireWire vs. USB
FireWire's maximum data rate is lower than that of USB, but FireWire provides DMA which allows for potentially higher performance with less CPU usage than USB.
