What are the four different kinds of unemployment and the characteristics of each

Structural:

A given set of skills is not needed by an economy, so people with those skills cannot find employment

Frictional:

When people are in a set period of unemployment whilst they wait to get a job that is already secured, or when people are looking for their first job

Seasonal:

When there is unemployment as the jobs only exist at certain times of the year (e. g. retail jobs at Christmas)

Cyclical:

When the growth of the economy has slowed and there is no demand for the production of the workers at all