The Raspberry Pi is a series of credit card–sized single-board computers developed in England, United Kingdom by the Raspberry Pi Foundation with the intent to promote the teaching of basic computer science in schools and developing countries. Today, RPi is considered as world's smallest and cheapest computer which is now most popular hardware used to design IoT based applications.
The
Foundation provides Debian and Arch Linux ARM distributions for
download, and promotes Python as the main programming language, with
support for BBC BASIC, C, C++, Java, Perl, Ruby, Squeak Smalltalk and
more also available. [Wikepedia]
On
29 February 2016, Raspberry Pi 3 is now on sale for US$35 (the same
price as the existing Raspberry Pi 2). Pi 3 adds the following new
features: A 1.2 GHz quad-core ARM Cortex-A53 CPU (~10× the
performance of Raspberry Pi 1 and compared with Pi 2 which is ~6×
performance of Raspberry Pi 1) based on ARM's latest ARMv8-A
architecture (which is compatible with older, and at first not used
to its full potential); has integrated 802.11n wireless LAN and
Bluetooth 4.1. Complete compatibility with Raspberry Pi 1 and 2.

The Specs
Quad-core 64-bit ARM Cortex A53 clocked at 1.2 GHz
Roughly 50% faster than Raspberry Pi 2
802.11n Wireless LAN
Bluetooth 4.1 (including Bluetooth Low Energy)
400MHz VideoCore IV multimedia
1GB LPDDR2-900 SDRAM (i.e. 900MHz)
Priced at $35
Operating systems supported:
Raspbian
Ubuntu Mate
Snappy Ubuntu Core
OpenElec
OSMC
RiscOS
Kali Linux
Windows 10 IOT Core
Read More news here:
Get Raspberry Pi Magazine: MagPi
Get OS Downloads: RPi
Get Raspberry Pi in India
Youtube link: https://www.youtube.com/watch?v=-Q_3pqoJWos