There's more to USBs than just the standard tip.
When the USB or Universal Serial Bus standard was originally created, there was just one type of female plug and one type of male plug (i.e. one fit into the other). However, the standard was created in the 1990s before the advent of ever smaller devices such as phones, cameras and eBook readers that required increasingly smaller tips to allow for connections to a computer. Therefore, new kinds of tips were created for these devices. One of the classes of these tips is called Micro USB and there are three types.
Micro USB A `
This format is recognized by the USB standards organization, USB-IF, and is in use in some devices such as cellular phones, GPS devices, Personal Digital Assistants and of course digital cameras. The plug is physically quite similar to the USB Mini-B plug and has five pins just like that plug. The plug maintains the same speed as standard USB offering 480Mbps (Megabits per second) connections to the main computer. It is typically white colored.
Micro USB B
The big difference between Micro USB A and Micro USB B is that the Micro USB B tip is typically black. Other than that, the tip is also commonly used for small devices such as cell phones, digital camera, e-readers and GPS units. It has a standardized connection and it is also capable of full 480Mbps connections to the main computer. This format is also recognized by the USB-IF.
Micro USB AB
Looking like a cross between the Micro USB A and Micro USB B connectors, this is a hybrid connector which is designed to allow you to connect either of the other two types of Micro USB tips. The connector is typically gray in color so as to distinguish it from the other two formats.
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