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Arduino is an open-source physical computing platform based on a simple i/o board and a user friendly development environment that implements the Processing/Wiring language.
The Arduino Ethernet Shield allows an Arduino board to connect to the internet
The Arduino Mega 2560 is a microcontroller board based on the ATmega2560
Arduino Nano is a surface mount breadboard embedded version with integrated USB. It is a smallest, complete, and breadboard friendly.
The Arduino Uno is a microcontroller board based on the ATmega328.
This is a upgrade processor for Arduino Diecimila/Duemilanove and is the same chip used in the UNO. It comes preprogrammed with Arduino-bootloader. You'll get about twice the program memory and twice the RAM.