The basics

Volatility

Volatility measures how much and how fast an asset's price moves. The higher it is, the faster the price swings.

Volatility describes how sharply a price jumps one way or the other. A highly volatile asset can gain or lose a lot in a short time; a low-volatility asset moves slowly. It says nothing about direction, only about the size of the swings.

For a trader, volatility cuts both ways: it creates opportunities but raises risk. The more volatile an asset, the more carefully the stop-loss and position size must be set.

Example

A calm stock moves 1% a day. On earnings day it swings 12% in minutes: its volatility has exploded, and the risk with it.

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