We calculate the volatility based on the data for the past 1, 3 and 5 years so that you can see if price fluctuations for the ETF became stronger or weaker over time. Assets with higher volatility are generally considered more risky.
The higher the volatility, the more significantly the price of the asset (stock, ETF, etc.) has changed in the past. The annualised volatility reflects the degree of price fluctuations during a one year period. Volatility, annualised, measured for 1, 3 and 5 year periods.