What are the visa & residency requirements in Berlin?

"In order to visit or live in Berlin, one must obtain a visa or residency permit. The process of applying for a visa depends on the purpose of the visit. For example, if the purpose of the visit is tourism, then a Schengen visa is required. This visa can be obtained from the German Embassy or Consulate in the applicant's home country. The application process requires the submission of a valid passport, a completed application form, and other documents such as proof of financial means and travel insurance. The process of applying for residency in Berlin is more complex. Depending on the purpose of the stay, the applicant may need to apply for a residence permit, a settlement permit, or a work permit. The application process requires the submission of a valid passport, a completed application form, and other documents such as proof of financial means, health insurance, and a valid job offer. The application must be submitted to the local immigration office in Berlin," remarked another expat who made the move to Berlin, Germany.