Registration in Germany. What is it for?
You must obtain a registration within two weeks after arriving in to the country in a case if you come to Germany not by a tourist visa for more than 3 months.
Refusal of registration or late registration at the place of residence is punishable by fines up to € 1,000.
You will not be able to open a bank account, get health insurance, or register a mailbox without a registration in Germany.