VIX (Volatility Index)

The VIX, often referred to as the CBOE Volatility Index, measures the stock market's expectation of volatility based on S&P 500 index options. It is sometimes known as the "fear gauge" or "fear index" as it represents investors' expectations for future market volatility over the next 30 days. High VIX values indicate increased volatility expectations, often corresponding to investor uncertainty or fear.