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How much and how fast prices move.
Volatility measures how much and how quickly a price moves up and down. Calm assets move a little each day; volatile ones can swing several percent in hours. The VIX index is often called Wall Street's 'fear gauge'.
A big bank stock might move 1% on a typical day, while a small crypto coin can move 15%.
Higher volatility means higher risk of big short-term losses. Knowing an asset's usual volatility helps you size your position and set realistic expectations.
Try it: Market Bubble Detector