Volatility-based indicators are valuable technical analysis tools that look at changes in market prices over a specified period of time. The faster prices change, the higher the volatility. The slower prices change, the lower the volatility. It can be measured and calculated based on historical prices and can be used for trend identification. It also typically signals if a market is overbought or oversold (meaning price is unjustifiably high or unjustifiably low), which can point to a stalling or reversal of the trend.