Learn in the textbookSerial and Short-Range Wireless Interfaces
DefinitionUSB is a widely used general-purpose serial interface (汎用シリアルインタフェース) standard for connecting a computer to peripherals by cable.
ExplanationIt uses serial transfer (シリアル転送), sending data one bit at a time over a single signal line. Devices as different as a mouse and an external storage drive connect under the same standard, and a USB hub (USBハブ) lets several devices share one port.
AnalogyIt is like agreeing on a shared language in advance, so people from different places can still talk to each other.
Memory hookShort for Universal Serial Bus: "universal" means it works with anything, and "serial" means data goes out in single file.