An indicator which characterizes the tendency of a market price change. Expressed in absolute values 5$ ± 5$ or in relative of the initial price 5$ ± 5%. Volatility is a measure of price variations in an asset over a period of time. An asset that experiences wide price variations in a short length of time is said to be volatile. Volatility can also be measured and traded as an asset. A popular volatility-based index is the Volatility Index (VIX).