It ascertains when and by what means you have become a German national and whether or not you have lost your German citizenship.
Many events in the applicants’ and their ancestors’ lives can be significant for the acquisition or loss of the German citizenship, including personal and family events (e.g. birth, marriage, or adoption) and/or political, legal developments (such as collective naturalizations during World War II or the acquisition of a foreign nationality).
Applicants whose German citizenship has been established are issued a certificate of nationality.
It can also be established, upon application, that you are not a German citizen. In such cases, a so-called negative certificate is issued.
Please note that the whole application procedure must be conducted in German.