The Universal Serial Bus (USB) interface has many uses, and it has become an indispensable part of modern electronic devices. The following are the main uses of USB interfaces:

1. Data transmission: One of the main purposes of the initial design of the USB interface is to carry out data transmission. Users can connect various devices (such as U disk, mobile hard disk, digital camera, etc.) to the computer through the USB interface, and quickly transfer files, pictures, videos and other data.

2. Device charging: Many USB interfaces, especially USB Type-C, support fast charging. This allows the USB interface to not only charge small electronic devices such as smartphones, tablets, etc., but also provide power for some high-power devices.

3. External device expansion: USB interface can be used to connect various external devices, such as printers, scanners, external hard drives, etc., so as to expand the functions of the computer.

4. Network connection: Some USB devices, such as USB wireless network cards or wired network cards, can be connected to the computer through the USB interface to provide users with network connection functions.

5. Video and audio transmission: Specific USB devices, such as USB TV sticks or USB sound cards, can transmit video and audio signals through the USB interface.

6. Equipment debugging and programming: In the development and debugging process, the USB interface is often used to connect the development board and the computer for program upload, debugging and data monitoring and other operations.

7. Auxiliary power supply: Some devices need additional power support during operation, and the USB interface can provide this auxiliary power supply, such as some USB desk lamps, USB fans, etc.

8. Firmware update: Many devices support firmware update via USB interface, which provides users with a convenient way to maintain and upgrade the device.

9. Compatibility and versatility: The USB interface has good compatibility and can connect a variety of different types of devices, and with the development of technology, the functions of the USB interface are constantly expanding and enhancing.

In general, the use of USB interfaces is very broad, covering almost every aspect of electronic device connection. With the continuous development of USB technology, especially the introduction of new generation interface standards such as USB Type-C and USB 4, the use of USB interfaces will be more diversified and efficient.