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The left figure shows the terminals of a USB connector. This is USB-Type-A male connector. This connector is the common type used for connection with PC.
The pinout description which viewed from connector side is GND(Ground for voltage), +DATA(Output from computer), -DATA(Input to computer) and +5V from the left.
The case of a connector is connected to the shield wire of the cable and grounded by the equipment side.
Specification of USB
The USB driver IC which used in this time supports USB Ver1.0 and 1.1. High-speed communication is possible for Ver2.0 but it doesn't use in this time.
I will explain the specifications for Ver 1.0 and 1.1 below. However, the contents to explain are not detailed. Please read some technical books, if you want to know more things.