The highlight of this board is an FT231X USB-to-Serial converter. That s what translates data between your computer and the XBee. There s also a reset button, and a voltage regulator to supply the XBee with plenty of power. In addition, there are four LEDs that ll help if you ever need to debug your XBee: RX, TX, RSSI (signal-strength indicator), and power indicator.
This board also breaks out each of the XBee s I/O pins to a pair of breadboard-compatible headers. So if you want to make use of the XBee s extended functionality, you can solder some header pins into those, or even just solder some wire.