Red stands for USB power supply: it is marked with the words VCC, power supply, 5V and 5VSB. White represents USB data lines: (negative electrode)-data-,USBD-, PD-, USBDT-. Green represents USB data lines: (positive electrode)-data+,USBD+, PD+, USBDT+. Black stands for ground wire: GND, ground.
Red, white, green and black are standard wiring colors, corresponding to 1, 2, 3 and 4 pins respectively. These four wires are 1- power supply 2- data 3- data 4- power supply. The general arrangement is: red, white, green and black from left to right. USB is a common PC interface, with only four wires, two power supplies and two signals. It should be noted that the positive and negative poles cannot be reversed, otherwise it will burn out the USB device or the south bridge chip of the computer.
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Interface-related categories:
1, B-5Pin: This interface is the most common one. Because of its excellent anti-misoperation performance and compact size, it is winning the favor of more and more manufacturers and is widely used in card readers, MP3 players, digital cameras, mobile hard disks and so on.
2. B-4pin: There is another form of Mini B 4pin, which is mini B4pin flat. As the name implies, this interface is flatter than Mini B 4Pin, and it is also widely used in devices.
3. B-8 PIN: MiniB 8Pin Circular Compared with the previous ordinary type, this interface changes the original D-type connector into a circular connector, and designs bumps to prevent accidental insertion.
Baidu encyclopedia -USB interface
Baidu encyclopedia -usb cable