There are many, different and sometimes a little complicated to understand but once in mind their function, you will not be able to be wrong. Know how to identify them.
USB
Relatively known, this connection is used to connect the “hot” computer devices. It is enough to connect the cable so that the device is recognized by the computer, without having to restart the system.
USB 2 offers flows of 480 Mbits/s and should be replaced in 2011 by USB 3 and its 4.8 Gbits/s flows. The USB is able to provide electricity with little greedy devices.
There are three types of USB formats: the male B (generally for printers), the mini USB B male (GPS, phones …), and the mini USB has male (ditto as the mini b male).
There are now Male USB keys in stamp format (see image opposite).