The VIX measures the "implied volatility" of S&P 500 options over the next 30 days.
What is the VIX Volatility Index and How Do You Trade it? - IG buying vix stock
Unlike a stock that can go to zero or the moon, the VIX is "mean-reverting"—it almost always eventually returns to its long-term average (historically around 19–20). 2. How People Actually "Buy" It The VIX measures the "implied volatility" of S&P