# Volatility

Measure the rate of price movement, regardless of direction. This is generally based on a change in the highest and lowest historical prices. They provide useful information about the range of buying and selling that take place in a given market and help traders determine points where the market may change direction.

* **Bollinger bands (Lagging):** Used to measure the "highness" or "lowness" of the price, relative to previous trades.
* **Average True Range (Lagging):** The indicator does not provide an indication of price trend, simply the degree of price volatility.
* **Standard Deviation (Lagging):** Used to measure expected risk and determine the significance of certain price movements.