Dupont wire is connecting the motherboard to any other device like steeper motor, endstop switch, fan, LED light. Based on the size of your printer, there are different length of the Dupont wire you can get. Also, there are 2 pins, 3 pins, 4 pins connection type to connect to other devices. The red wire of the Dupont cable is positive which should be connected to (+) power. The black wire of the Dupont cable is negative which should be connected to (-) power. And the Dupont cable is directionally cable, if you not connect the cable correctly, it may damage the devices.
This Extension Cable can make the standard cable longer
Male to Female ( M – F)
Connection pins: 2 pins/ 3 pins / 4 pins