one
Red and black are the power cables, red is the positive electrode, black is the negative electrode.
two
USB power cable, red is the positive voltage of 5v, black is the negative voltage of 5v, these two are usually used for power supply, the other two, white and green are data lines, one accepts data, one sends data. Green is the positive voltage data line, white is the negative voltage data line, these two are used for data transmission. USB is a commonly used PC interface, only 4 lines, two power supplies and two signals, pay attention to, do not reverse the positive and negative terminals, will burn the USB device or the computer's south bridge chip.
The general black line indicates ground, count it as negative.