Raspberry Pi is a Miniature Computer that can Interface with a Display Device like TV and a keyboard.
Learning Programming with DIY Computing
We now also have a tiny ARM SoC mini computer called Raspberry PI which helps you know how a computer works. Browse the Internet on your TV or learn coding in many programming languages.
(These ARM based devices power many of the small portable electronics we see today.)
Model A has been redesigned to have 256Mb RAM, one USB port and no Ethernet (network connection). Model B has 256Mb RAM, 2 USB port and an Ethernet port.
The SoC is a Broadcom BCM2835. This contains an ARM1176JZFS, with floating point, running at 700Mhz, and a Videocore 4 GPU. Overall real world performance is something like a 300MHz Pentium 2, only with much, much swankier graphics.
There is composite and HDMI out on the board, so you can hook it up to an old analogue TV, to a digital TV or to a DVI monitor. No VGA support.