The Raspberry Pi is a credit card sized CPU, which can be connected to a Monitor or Television over standard video cable or over HDMI. There are 2 models of Raspberry Pi – Model A and B. The primary difference between the two is that Model B has an ethernet port, 2 USB ports and costs a meager $10 more. What’s the base price? $25!!!!
It runs debian linux and is pretty quick to boot up and is very responsive. Other specs included 256Mb of memory, a 700Mhz ARM11 processor and your OS on an SD card.
You can take a quick peek at the video below to believe it:-

As of now, the Raspberry Pi servers are overloaded and they are already out of stock.