Bollinger Bands: At the core, Bollinger Bands are a simple measure of volatility, showing how far up or down the market is moving during a certain period. They are a great display for traders looking for periods of coin being overbought or oversold. The farther the coin price moves towards the upper band, the more overbought it is. The opposite is true as the price moves towards the lower band. Another pattern that traders can use is to look for periods of high volatility and low volatility as they often follow each other. This can be seen in the chart below as the price of the coin has a large movement and then starts to even out. It is also very easy to see that near the center of the chart there is a break of the upper band and the price immediately reacts downwards.