What is USB standard and devices?

The USB (Universal Serial Bus) standard is a set of protocols and specifications for connecting computers and peripheral devices, enabling data transfer and power supply. It supports various device types, including keyboards, mice, printers, external hard drives, and smartphones. Over time, USB has evolved through multiple versions, such as USB 2.0, USB 3.0, and USB-C, each offering improved data speeds and power delivery capabilities. USB devices are widely used due to their plug-and-play functionality and versatility.