Vorstadt

In German, a Vorstadt is an area of a city that is outside the Altstadt (city center) but tightly connected to it and densely populated, thus distinguishing itself from a "Vorort" (suburb).
Historically, a "Vorstadt" ("suburb" in German) was a settlement outside the city walls, sometimes dedicated to specific trades. Later, large Vorstädte appeared in Gründerzeit era. Places named "Vorstadt" include Vorstadt (Königsberg) and Oranienburger Vorstadt.
Its French equivalent is "faubourg", the Dutch equivalent is "Voorstad", e.g. "Voorstad St. Jacob" in Roermond.
Vienna.
In Vienna, the historical "Vorstädte" need to be distinguished from the "Vororte". The Vorstädte were located outside the city walls, but within the "Linienwall", a second ring of fortifications outside the city. The city walls were located in the place of the modern Ringstraße, while the "Linienwall" has been removed to give way for the "Gürtel" (both being rings of streets around the central city). The "Vorstädte" therefore correspond to the so-called "inner districts" of Vienna (2nd to 9th and 20th districts).