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The Arduino Mega 2560 Rev3 is a microcontroller board based on the ATmega2560 (datasheet).
IIt has 54 digital input/output pins (of which 14 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.
The Mega 2560 R3 is compatible with most shields designed for the Arduino Duemilanove or Diecimila.