Bollinger Bands Width is a measure of the distance between the upper and lower Bollinger Bands. It quantifies the volatility of a security. When the bands are wider, it indicates higher volatility, while narrower bands suggest lower volatility.

Traders can monitor changes in Bollinger Bands Width to identify periods of low volatility that may precede significant price movements. A contraction in width often suggests an imminent increase in volatility, while an expansion indicates an ongoing volatile market condition. By incorporating Bollinger Bands Width into their analysis, traders gain insights into market volatility and can adjust their trading strategies accordingly.