A-kassa is short in Swedish for arbetslöshetskassa, or unemployment insurance fund. If you become unemployed, being a member of A-kassa, or unemployment insurance fund, provides security (http://www.samorg.org). To have the right to benefit you must have been a member of an unemployment insurance fund for at least 12 months without a break. This is why it is important to apply for membership of a fund as soon as you start working. There are different funds for different industries. If you become unemployed without being a member of an unemployment insurance fund, then Alfa-kassan (https://www.alfakassan.se/) and the basic insurance are what apply in your case.