How Does the “Greeks” (E.g. Theta, Vega) Measure Options Risk?
The Greeks are a set of risk measures that quantify the sensitivity of an option's price to changes in various factors. Theta measures the rate of time decay (loss of value as expiration nears).
Vega measures the sensitivity to changes in implied volatility. They are essential for traders to manage the multi-faceted risks inherent in options portfolios.