VIX (Volatility Index)

The VIX is a number that measures how much investors expect the stock market to bounce around in the near future—basically, market nervousness. It's calculated from options prices (contracts that let you bet on future stock moves) on the S&P 500, a major stock index. You'll see the VIX mentioned in financial news whenever markets get shaky, because it tends to spike when investors are scared and drop when they're calm. Think of it like a fear gauge: a VIX around 15 means investors are relaxed, while a VIX above 30 signals real anxiety. Traders watch it to decide whether to play it safe or take bigger risks with their money.