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Universal serial in USB interface means that the signal line and power line are shared (two-wire system). IEEE1394 serial interface is that the signal positive pole and power positive pole are separated and the negative pole is shared (three wire system). In addition, there are four wire system (SATA hard disk interface: power line and signal line are separated). In addition to the differences in the wire system used, there are also differences in voltage, interface size, pulse time, etc.  
 
Serial communication here refers to the use of a data line to transmit data bit by bit, and each bit of data occupies a fixed length of time.  
Universal serial bus (USB) is a new PC serial communication protocol jointly formulated by Microsoft, Compaq, IBM and other companies in 1995.  
Serial interface is abbreviated as serial port, also known as serial communication interface (usually COM interface), which is an extended interface using serial communication mode. Serial interface includes RS-232-C, RS-422, RS485, etc. according to electrical standards and protocols.  
IEEE1394 is one of the serial interface standards.