Among the many wired interfaces, the most commonly used one is the USB interface. USB is the abbreviation for Universal Serial Bus in English. The USB interface is currently one of the most commonly used interfaces on laptops, as most external devices, such as USB drives, portable hard drives, mice, mobile phones, etc., are connected to laptops through a USB interface.

The USB interface has four main characteristics:

    1. Most USB devices can be hot swapped, and the USB cable can be plugged in and used when the PC is turned on;

    2. USB devices are mostly portable, with "small, light, and thin" devices being the most convenient way to exchange data;

    3. The USB interface standard is unified and widely used, and mobile hard drives, mice, printers, etc. can be connected to USB universally;

    4. Multiple devices can be connected. USB often has multiple interfaces on a PC and can connect multiple devices simultaneously. If a USB HUB is connected externally, there are more devices that can be connected.