Unconditional heteroskedasticity

Unconditional heteroskedasticity occurs when heteroskedasticity of the error variance is not correlated with the independent variables in the multiple regression.

Can some one explain error variance?

You have a bunch of error terms: one for each observation. Some are big, some small, some positive, some negative.

The _ error variance _ is the variance of these error terms.

Thank you S2000magician!