USB Connectors - As we said in the previous item, USB has evolved focusing on compatibility. With almost two decades of development, it is still theoretically possible to use a USB 3.1 USB stick on a USB 1.1 port. We say ?? theoretically ??, because the USB 1.1 port may not offer enough power for a 3.1 device, but there are no incompatibility issues, so to speak. What happens is that the transfer speed is limited to the smaller version (in this case, the USB 1.1 port)

TYPE B - For a long time coexisted with USB type ?? B ??, still quite common in printers and other devices, but increasingly in disuse. Its reduced versions are quite common even today.