Technical Analysis is a series of methods to trade stocks, and a very crucial one for traders. In this series of video go from basics to in depth of one of the most fascinating things in investing.
(From Investopedia.com)
The methods used to analyze securities and make investment decisions fall into two very broad categories: fundamental analysis and technical analysis. Fundamental analysis involves analyzing the characteristics of a company in order to estimate its value. Technical analysis takes a completely different approach; it doesn't care one bit about the "value" of a company or a commodity. Technicians (sometimes called chartists) are only interested in the price movements in the market.