Figures that show an average return on an investment are only part of the story. They don’t tell how that return was achieved. Is the investment a volatile one, with a lot of ups and downs in price or returns that varied dramatically? Or was its performance relatively steady, with prices and returns that were very similar month to month or year after year? Understanding volatility measures can help you evaluate whether a particular investment is suited to your own investing style. Volatility measurements can be used to evaluate the performance of mutual funds and investment portfolios as well as individual securities.