The Chicago Board of Options Exchange Market Volatility Index (VIX) is a measure of implied volatility, based on the prices of a basket of S&P 500 Index options with 30 days to expiration. The Cboe Volatility Index, commonly known as the VIX or "fear index," represents the market's expectation of volatility over the next 30 days. Introduced by the Chicago Board Options Exchange (Cboe) in 1993, the VIX...