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One of the most convenient features of USB cables and devices is their ability to be "hot swapped," which means that they can be plugged into - and unplugged from - a computer as needed, without that computer needing to be powered down first.
USB connectors - and, by extension, USB ports - can be found in two different styles: type "A" (for hosts and USB hubs) and type "B" (for peripheral devices). In addition, USB plugs fall into three different size ranges: standard, mini, and micro. Here's a general breakdown of how connector styles differ by size class.
Generally speaking, USB cables are classified into one of two different bandwidth groups: 1.1, which transfers data at a maximum rate of 1.5 Mbit per second, and 2.0, with a 480 Mbit per second data transfer rate. USB 2.0 is backward compatible with the lower data transmission requirements of 1.1, but the substitution can't be reversed, 1.1 just can't deliver the rate of data transfer that USB 2.0-rated devices need.
