**HAT** (*Hardware Attached on Top*) is a new module for the *Raspberry Pi B +* who add functionality to it and is mounted on top like a *Arduino Shield*.
*Adafruit* was developed during the last week a prototype every day and the result will be able to check on your [web](http://www.adafruit.com/blog/?s=%23hataday).
I leave you some links if you want more information about HATs:
Link: [raspberrypi.org > Introducing Pi HATs](http://www.raspberrypi.org/introducing-raspberry-pi-hats/)
Link: [design guide](https://github.com/raspberrypi/hats/blob/master/designguide.md)
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