The difference is that the transmission rate of usb3.0 is ten times that of USB 2.0. The rate of USB 2.0 is 480 Mbps, while USB 3.0 can reach 4.8 Gbps
The technical specifications of USB2.0 are determined by Developed and released jointly by Compaq, Hewlett Packard, Intel, Lucent, Microsoft, NEC, and Philips, the specification increases the peripheral data transmission speed to 480Mbps, which is 40 times that of USB 1.1 devices! But according to the original plan, the new USB 2.0 standard was only going to set this standard at 240Mbps. Later, after efforts, it was raised to 480Mbps.
USB 3.0 has an interface that is compatible with older versions of the standard, supports general-purpose I/O, and will be optimized to reduce energy consumption while improving protocol efficiency in computers, consumer products, and mobile products. Products that support Fast synchronized mobility, capable of supporting both optical and digital component specifications, with the ease of use and plug-and-play features of traditional USB technology.
Extended information:
USB is the abbreviation of English Universal Serial Bus (Universal Serial Bus). It is an external bus standard used to standardize the connection and communication between computers and external devices. . It is an interface technology applied in the PC field. The USB interface supports plug-and-play and hot-swappable functions of the device. USB was jointly proposed by Intel, Compaq, IBM, Microsoft and other companies at the end of 1994.