Risk takes on many forms but is broadly categorized as the chance an outcome or investment's actual return will differ from the expected outcome or return.| Investopedia
Standard deviation is a statistic measuring the dispersion of a dataset relative to its mean. It is calculated as the square root of the variance. Learn how it's used.| Investopedia
The Sharpe ratio is used to help investors understand the return of an investment compared to its risk.| Investopedia