What is Arduino ?

This video gives a brief description of Arduino, its uses, various models released so far and hardware components which make up popular Arduino Boards.
Some links for more deep dive -
Arduino Website: www.arduino.cc/
Arduino Uno R3 Docs: docs.arduino.c...
Arduino Uno R3 Datasheet: docs.arduino.c...
Links with comparison between different Arduino boards:
www.homemade-c...
trainings.inte...
www.oreilly.co...
Development Boards: robocraze.com/...
Basic Project: docs.arduino.c...
Quartz Crystal Oscillator :
www.electronic...
www.tutorialsp...