This breakout helps you to make make prototypes with the Pi . 

This kit comes with a fully assembled PCB with socket and headers as well as a 26 pin ribbon cable No soldering required! The cable plugs between the Pi computer and the Cobbler breakout. The breakout can plug into any solderless breadboard. The Cobbler PCB has all the pins labeled nicely so you can go forth and build circuits without keeping a pin-out printout at your desk.