Only Norwegian citizens will be able to apply for this for the time being, and it is voluntary to have a national ID card.
It is possible to get the national ID card with “the right to travel” so that you can use it as a travel document (in the same way as a passport) when you travel to the EEA countries and Switzerland.
You must book an appointment with the police to apply for a national ID card (external website), in the same way as you apply for a passport.