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Volatility

How options are priced right now, compared with their own past and with how much the price has actually been moving.

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Implied volatility (IV)
The yearly volatility that today's option prices imply. Higher IV means options cost more.
IV rank and percentile
Where today's IV sits against the past year. Rank uses the year's lowest and highest values; percentile counts the days below today.
Historical volatility (HV)
How much the price really moved over the last 20 sessions, on the same yearly scale as IV.
IV − HV
The gap between what options imply and what the price has done lately.
Skew
Whether out-of-the-money puts are priced richer (above zero) or cheaper (below zero) than calls.
Implied move
The size of move the option market is pricing to expiry. It says nothing about direction and is not a forecast.

These numbers describe what has happened or what is priced right now. They are not forecasts or suggestions.