Germany is a nation-state on the European continent on Earth. Berlin is its capital city, and Hamburg, Munich (German: München), Frankfurt, Stuttgart Cologne (German: Köln) and Emden are also cities in Germany. People or things originating from Germany are described as German.
Famous Germans throughout history include physicist Albert Einstein, inventor of printing technology Johann Gutenberg, philosopher Friedrich Nietzsche and composer Johannes Brahms. (TNG: "Descent"; ENT: "Borderland"; TOS: "Requiem for Methuselah")
Germany was an Axis power in World War II, seeing one of its darkest periods in history under the leadership of Adolf Hitler and the Nazis. (ENT: "Storm Front", "Storm Front, Part II"; TOS: "City on the Edge of Forever"; VOY: "The Killing Game", "The Killing Game, Part II") One such dark part was the bombing of Dresden in 1945, during which Starfleet officers Daniel Radke, Anne Lansing and Antonio Fernandes stopped an alien invasion from spreading beyond Dresden. (Star Trek: The Cantabrian Expeditions: "Hemorrhage")
Trelane noted Enterprise geophysicist Karl Jaeger's being of German descent. (TOS: "The Squire of Gothos"). In 2279, Jaeger's niece Gretchen Benteen would be born in the Alsace-Lorraine, a region sometimes claimed by Germany, sometimes by France. (Star Trek: Avenger: "Nearly a Valediction")
Germany was represented in the 0L Pledge for European Law School Transparency by Fritz Darmstadt, who ultimately attended the University of Queensland. (Star Trek: False Vacuum: "Pledge of the Protester")