RWBY (pronounced Ruby) is an American anime-style web series created by Monty Oum and produced by Rooster Teeth Productions.
The first trailer was released on November 7th, 2012, showing”Red” Ruby fighting against a large pack of Beowolves.
The second trailer was released on February 14th, 2013, showing “White” Weiss singing in front of a crowd and having a flashback to a fight with a giant suit of armor.
The third trailer was released on March 22nd, 2013, showing”Black” Blake and her partner, Adam Taurus, raiding a cargo train and fighting mechanical soldiers and a large security droid.
The fourth and final trailer was released on June 1st, 2013, showing “Yellow” Yang searching for information about someone at a club, then fighting Junior Xiong and his henchmen.
RWBY is an acronym made from the first letters of Red, White, Black, Yellow – which corresponds to each main character’s “color”. Ruby was the first character of these four to be revealed in the series, with Weiss being the second, Blake the third and Yang the fourth.
Cr : http://rwby.wikia.com/wiki/RWBY