Below is the 50 day (green line) & 200 day EMA (red line) chart of Nasdaq Composite.

Its a very useful chart as 50 day EMA and 200 day EMA are very crucial to predict bearish and bullish moves.

50 day EMA is considered for short term and 200 day is considered for long term

Below is the 3 day (green line) and 15 day EMA (red line) Chart of DJIA. Its more for intra-day and monthly short term prediction. The 3d EMA (green) above the 15d EMA (red) is considered a bullish zone and the vice versa as a bearish zone.