Unemployment insurance is voluntary in Denmark. This means that you are not automatically insured against unemployment.
In order to be insured against unemployment in Denmark, you have to take out unemployment insurance with an unemployment insurance fund (A-kasse). These are private organisations that are often linked to specific labour unions. You do not have to be a member of a particular labour union, however, to take out insurance with a particular unemployment insurance fund.
In order to receive unemployment benefits, you have to have been a member of an unemployment fund for at least one year and have worked at least 52 weeks within the past three years.