Gordon8
One way of looking at volatility is to measure average daily range in a particular stock/index or whatever.
So for example maybe the range would be 100 points on busy days and 50 on quieter, the more movement there is the more possibilities to make money out of it, also lack of dicipline on taking losses has a magnified effect.
Volatility tends to move to extremes and back again, so a period of very low volatility, will be followed by a period of high volatility.