Vix
In short
VIX is a real-time index that measures how much stock market traders expect volatility to change in the next 30 days.
In plain words
It tracks how much people expect prices to swing up or down. When people are nervous about the market, the VIX goes up. When investors feel calm, the VIX usually goes down.
A simple example
If a major political event is coming up, investors might buy protection against price drops. This causes the VIX to spike as fear increases.
Why it matters
It acts as a barometer for market fear and uncertainty. Professional traders use it to decide how much risk to take with their money.
Easy to mix up
Do not confuse it with a specific stock or company; it is a mathematical calculation based on many different options.