The Raspberry Pi is equipped with a row of 2x13 pin headers. These aren't just for show however, these GPIO (General Purpose Input/Output) pins can be used to access a whole new world of fun with your Raspberry Pi. Through programming the Pi, these GPIO ports are able to undertake a variety of tasks including playing with LEDs, running motors and sending and recieving data.
So, if you want to get your Raspberry Pi interating with physcial hardware electronic systems such as a breadboard, you'll most likely want to bridge the connections with a ribbon cable and socket connector.
The assembled ribbon cable consists of two 2 * 13 Pin Socket connectors assembled on a 500mm length of Rainbow Ribbon cable.
The magic thing about rainbow ribbon cable is that you can easilly uniquely identify each wire in the ribbon!