For the past 10 years USB2 has been the most popular way of connecting external devices, such as digital cameras and hard drives, to computers.
Now USB3 hardware is starting to appear on the market.
The new system, which stands for Universal Serial Bus, is said to be up to 10 times faster than the old one.
Users need a laptop with built-in USB3 sockets or a desktop with USB3 motherboard or expansion card and the devices also need to be USB3 capable.
Newsbeat's technology reporter Iain Mackenzie looks at how the two versions compare.