The 3 fields and concepts you'll meet in the response — defined in plain English, each with a real example value.
A stock market index tracking 500 of the largest publicly traded companies in the United States.
The S&P 500 is weighted by market capitalization, meaning larger companies have more influence on the index value. It covers approximately 80% of available US market capitalization and is widely considered the best single gauge of large-cap US equities.
A price-weighted index of 30 prominent US companies, one of the oldest stock indices.
Unlike the S&P 500, the Dow is price-weighted, meaning stocks with higher prices have more influence regardless of company size. It includes major companies like Apple, Microsoft, and Goldman Sachs.
A real-time index representing expected market volatility over the coming 30 days.
The VIX is calculated from S&P 500 option prices. Values below 20 generally indicate low volatility and investor complacency, while values above 30 indicate high volatility and market fear. It is often called the "fear gauge".
