USB - connectors for serial data transfer. Used to connect low-speed and medium-speed peripherals in computing. Devices are connected to the USB bus with a four-wire cable: two wires are used to receive / transmit data, the other two are used to power peripheral devices.
FireWire (IEEE 1394) - connectors for connecting a serial high-speed bus, with the help of which digital information is exchanged between a computer and other electronic devices. They usually have 4 pins (2 for receive, 2 for transmit), may also have an additional 2 wires for receiving and transmitting, and 1 more spare pin.
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