Volatility is a common measure in financial markets that refers to the degree of variation of a trading price series over time. It is often used as a measure of risk and uncertainty in financial markets and is typically calculated using statistical methods such as standard deviation or variance. Volatility can be influenced by a variety of factors such as economic events, market conditions, and investor sentiment. Traders and investors often use volatility as a key indicator to make informed decisions on when to enter or exit positions in the market.