The standard A to B cable connects a computer to a peripheral, such as a printer or scanner. For all devices check the type of connector needed.
USB v2.0 is a high-speed connection method which is 40 times faster than USB v1.1 (480Mbps as opposed to 12Mbps). It is plug & play and hot-swappable (no need to turn off your PC to plug a device in or out).
USB v2.0 cables will still work with USB v1.1 computers (they are backwardly compatible) and peripherals, but only if both Computer and Peripheral are USB v2.0 will they work at High Speed (480Mbps).
USB v2.0 peripherals will not work at High Speed (480Mbps) unless they are connected with a USB v2.0 cable and connected to a computer equipped with USB v2.0 ports.
