Germany's 16 Länder and the two offices at the top of a federal parliamentary republic
Background
The European Union's country profile describes Germany as a federal parliamentary republic with a chancellor who is the head of government, and a president who is the head of state and whose main responsibilities are representative. The country consists of 16 states (Länder) which each have their own constitution and are largely autonomous regarding their internal organisation. 3 of these are city-states: Bremen, Berlin and Hamburg. Berlin is therefore at once the national capital and a state in its own right. Because the president's role is mainly representative, executive leadership of the government rests with the chancellor. In the European Union's own institutions Germany has 96 representatives in the European Parliament, and 24 representatives each on the European Economic and Social Committee and the European Committee of the Regions.
In plain words
Länder Land (singular), Länder (plural) — Germany's constituent states — Each of Germany's 16 states is a Land, and each writes its own constitution.
City-state A city that is also a constituent state — A single city holding the full status of a state rather than lying inside one.