The Raspberry Pi is a credit-card sized computer board that plugs into a TV and a keyboard. It’s a miniature ARM-based PC which can be used for many of the things that a desktop PC does, like spreadsheets, word-processing and games. It also plays High-Definition video. The Raspberry Pi Model B and Model B+ boards are supplied as the board only, and come without operating system, SD card, power supply, keyboard, case or cables.
Buy our pre-loaded SD card or download and install on your own from here