What does usb mean?

Universal Serial Bus (English: Universal Serial Bus, abbreviation: USB) is a serial bus standard and a technical specification for input and output interfaces. It is widely used in personal computers and mobile devices. Information and communication products, and expanded to photographic equipment, digital TV (set-top boxes), game consoles and other related fields. The latest generation is USB4, with a transmission speed of 40Gbit/s, a three-stage voltage of 5V/12V/20V, and a maximum power supply of 100W. The new Type C interface allows blind plugging of the front and back.