Bollinger Bands Indicator is an oscillating indicator that is used to measure market volatility. It allows you to assess whether the price is high or low compared to the recent moving average, and to predict the possibility of falling or rising to its level. In particular, this data helps you decide to buy or sell an asset.
Bollinger Bands are made up of three main lines. The central band corresponds to the simple moving average of the price. The upper and lower bands represent the levels at which the price can be considered high enough or low enough to the recent moving average.