"Structural unemployment is a unemployment that comes from there being an
absence of demand for the workers that are available."
"Frictional unemployment is unemployment that comes from people moving
between jobs, careers, and locations."
"Cyclical unemployment occurs when the unemployment rate moves in the opposite
direction as the GDP growth rate. So when GDP growth is small (or negative)
unemployment is high."
Seasonal unemployment is unemployment due to changes in the season - such as a
lack of demand for department store Santa Clauses in January. Seasonal
unemployment is a form of structural unemployment, as the structure of the
economy changes from month to month.