If you aren't familiar with the Electric Imp, it essentially provides an easy, integrated way to connect almost any hardware device both to other devices and to internet services. The Electric Imp Breakout Board allows you to explore the capabilities of the Imp by providing standard 0.1" headers to solder to as well as the necessary CryptAuthEE IC to identify your prototype to the Imp Cloud service!
This is just the development board, so you'll need to buy the Imp separately, check the related items below!
Note: If you want to use the mini-USB or battery inputs for power, you will need to populate the 3-pin jumper and set it to either 'BAT' or 'USB'. Otherwise, you can just simply power the board using VIN and GND without the use of a jumper.