Hi Dimi3h, welcome to the community
AFAIK that called Candlestick Chart. It usually used to predict trends and market volatility. The name Heikin-Ashi came from Japanese language which means average (IIRC)
The color is used to distinguish price movement, blue = increase while brown = decrease. Be aware that color may differ on other chart, white-black pair or red-black pair is usually used.
I'm pretty sure someone will correct me if I'm wrong. :p If not, then please visit this site which contain detailed info and technical explanation.
http://www.investopedia.com/articles/technical/04/092204.asphttp://www.investopedia.com/active-trading/Good luck, live long and prosper