Variance is a measure of the variability of returns,and since it involves squaring the deviation of each actual return from the expected return,it is always larger than its square root,its standard deviation.

Variance

A measure of the distribution’s variability. It is the sum of the squared deviations about the expected value.

Standard Deviation

A statistical measure of the dispersion or variability of a set of numbers, indicating how much the individual numbers differ from the mean.

Deviation

The difference between a specific value and a reference point, often used in statistics to measure variability.