Like all technology, Universal Serial Bus - USB has evolved over time. Originally developed to minimize the number of peripheral ports on a PC, USB is now a comprehensive set of interface specifications for high speed wired communication between a wide range of devices, with or without a computer. USB is increasingly being used in AV systems for much more than basic keyboard and mouse connections. It is used for connecting storage devices, extending and distributing audio and video signals, and even for transmitting power. With increased bandwidth, a smaller connector format, and support from major device manufacturers, USB seems primed to act as the single connector for laptops and other portable systems in the future. AV professionals will benefit from understanding how USB works, including its advantages and limitations, in order to optimize its use in a Pro AV environment.