Volatility, measured by standard deviation, shows how widely a fund's returns have swung around their average, stated as a yearly percentage.
Standard deviation measures how spread out a fund's returns have been. A fund whose returns stay close to their average has low volatility. One whose returns jump around has high volatility. It is usually worked out from daily or monthly returns and stated as a yearly figure.
For example, a fund has averaged 12% a year with a standard deviation of 15%. As a rough rule, in about two years out of three its return would fall within one standard deviation of the average, between a loss of 3% and a gain of 27%. The other years would fall outside that range.
Typical levels differ by fund type:
Volatility counts rises and falls alike, so a fund that jumped sharply upward shows high volatility too. The Sortino ratio and drawdown focus on the falls.
Volatility is the risk measure inside the Sharpe ratio. It describes the past and changes with market conditions.
Each fund page has its returns, risk, costs, managers and everything it holds.