That new Raspberry Pi computer you just got has a row of 2×20 pin headers soldered on – those are the GPIO (general purpose input/output) pins and for those of us who like to hack electronics they are where the real fun is. By programming the Pi, you can twiddle those pins high or low, send and receive I2C and SPI data, and access the 3V and 5V power rails.
If you want to bridge those contacts out onto another PCB, you'll want this cable! It's 20cm long and has 40 socket & wire sets.
Are you looking to expand your horizons and start controlling the physical world around you with your Raspberry Pi? If so, the Gertboard is for you!
Yu can detect and output analogue voltages, drive motors, detect switch presses, illuminate LEDs and drive relays. Jumper cables allow you to hook up different parts of the circuit in any different ways, allowing total flexibility all controlled by your Raspberry Pi.