Apply for a national visa
Source: BUS Rheinland-PfalzDepending on your nationality, you will need a national visa for stays in Germany lasting longer than 90 days. The procedure and requirements also depend on the purpose for which you wish to stay in Germany (e.g. employment, family reunification, studies and training).
Citizens of EU member states and some other countries (e.g. Iceland, Liechtenstein, Norway, Switzerland, USA, Canada, Australia) do not require a visa. As a rule, they can also enter the country for a longer stay without a national visa and apply for their residence permit at the immigration office after entering the country. You can find a complete list of countries with details of the respective visa requirements on the website of the Federal Foreign Office.
In certain cases, you must provide proof of German language skills. The issue of the national visa is governed by the same regulations that apply to the issue of the residence permit that you must apply for in Germany after your visa expires (e.g. residence permit, EU Blue Card).