What does it mean to be a sponsor?
People who are going to visit Norway must prove that they have enough money for their stay in Norway and the return journey. If a person who is going to visit Norway does not have enough money themselves, a person who lives in Norway may be a sponsor for the stay. The sponsor must complete a sponsorship form.
You will find the sponsorship form and more information about being a sponsor here.
Previously, sponsors had to present their passports and documentation of income/funds to the police. The guarantee form also had to be stamped by the police. With the new sponsorship form, you do not need to go to the police and get a stamp.