Universal Serial Bus (USB) is an emerging data communication method that has gradually replaced other interface standards. It was established in 1995 by computer companies and communication companies such as Intel, Compaq, Digital, IBM, Microsoft, NEC, and Northern Telecom. Jointly formulated in 1986, and gradually formed industry standards. As a high-speed serial bus, the USB bus can meet the requirements of high-speed data transmission application environments. The bus also has simple power supply (bus-powered) and convenient installation and configuration (supports plug and play Hot plugging), simple expansion ports (up to 127 peripherals can be expanded through the hub), diversified transmission methods (4 transmission modes), and good compatibility (downward compatibility after product upgrade).
Since its introduction, the universal serial bus (USB) has successfully replaced serial and parallel ports, and has become one of the standard expansion interfaces and necessary interfaces for a large number of computers and smart devices in the 21st century. It has now developed to the USB 3.2 version. USB has the advantages of fast transmission speed, easy to use, support for hot plugging, flexible connection, independent power supply, etc. It can connect a variety of peripherals such as keyboard, mouse, mass storage devices, etc. This interface is also widely used in smart phones. The interaction between smart devices such as computers and external data is mainly based on network and USB interfaces.