Arduino is an open-source hardware and software development board based on AVR series of microcontrollers. The project is based on a family of microcontroller board designs manufactured primarily by Smart Projects in Italy, and also by several other vendors, using various 8-bit Atmel AVR microcontrollers or 32-bit Atmel ARM processors. These systems provide sets of digital and analog I/O pins that can be interfaced to various expansion boards ("shields") and other circuits. The boards feature serial communications interfaces, including USB on some models, for loading programs from personal computers. For programming the microcontrollers, the Arduino platform provides an integrated development environment (IDE) based on the Processing project, which includes support for C and C++ programming languages.
Arduino Uno is one of the easiest to work among several arduino development boards. Here is a tutorial to get started and blink an LED with Arduino.
Here is an awesome video to get started with arduino:
You can find the simple code required to blink an external LED with Arduino Uno here.
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