The Raspberry Pi is a tiny computer (about the size of a credit-card) that was designed in the UK by the Raspberry Pi Foundation.
Originally intended to assist in teaching computer science, the Pi's accessible price makes it popular with hobbyists/makers/hackers who use it to create everything from Living Room PCs to Robotics Projects.
The powerful graphics capabilities and HDMi video output make it ideal for multimedia applications such as media centres and narrowcasting solutions. The Raspberry Pi is based on a Broadcom BCM2835 chip. It does not feature a built-in hard disk or solid-state drive, instead relying on an SD card for booting and long-term storage.
So whether you want to learn to programme, hack around with some hardware or design it in at the core of your innovative new device. The only challenge is deciding what you will do with yours?