Abmeldung (deregistration)This is the step that officially ends your residence in Germany, due within two weeks of moving out and possible at the earliest one week before. It produces the Abmeldebescheinigung, the proof you'll need to cancel your broadcasting fee and insurance and sort out your taxes. Skip it and Germany still counts you as a resident.Anmeldung (registration)You register every German address this way, including when you return from abroad. Without it you can't get a Meldebescheinigung, and often no bank account or phone contract either. For people leaving Germany it's the mirror image of the Abmeldung.Abmeldebescheinigung (deregistration certificate)The Bürgeramt issues this document once your Abmeldung goes through, dated to your official move-out day. You'll need it to cancel the Rundfunkbeitrag, adjust or close insurance, and show the tax office when your German residence ended. Keep a copy, because providers ask for it as proof.Apostille (international authentication)An apostille certifies that a German document is genuine so another country will accept it, for example birth, marriage and school certificates for use in Spain, Portugal, Mexico or Thailand. Get it before you emigrate, because arranging it from inside Germany is far faster than from abroad. Which office issues it depends on the document type.A1-Bescheinigung (A1 certificate)The A1 certificate shows that German social security law still applies to you during work in another EU country. It matters for postings and for people working across several countries, and it's valid in the EU, the EEA and Switzerland. It stops you paying social contributions twice, in two states at once.