The Raspberry Pi is an amazing small computer, not much larger that a credit card, that is now being used in many ways, so many it is too much to describe here.
The entry in Wikipedia is here http://en.wikipedia.org/wiki/Raspberry_Pie
The web site is here. http://www.raspberrypi.org/
Extract from their site
The Making of Pi The idea behind a tiny and affordable computer for kids came in 2006, when Eben Upton, Rob Mullins, Jack Lang and Alan Mycroft, based at the University of Cambridge’s Computer Laboratory, became concerned about the year-on-year decline in the numbers and skills levels of the A Level students applying to read Computer Science. From a situation in the 1990s where most of the kids applying were coming to interview as experienced hobbyist programmers, the landscape in the 2000s was very different; a typical applicant might only have done a little web design.