Unemployment (or joblessness) occurs when people are without jobs and they have actively sought work. Therefore, the unemployed in a country are those with age, ability and desire to work (labor force) but do not have a job.
The number of unemployed in a country usually was expressed in terms of the labor force, and it is called unemployment rate. The unemployment rate is a percentage and it is calculated by dividing the number of unemployed people by all individuals currently in the labor force.
Unemployment rate = Total Unemployed / Labor force