Flag of Germany is a tricolor flag with three horizontal stripes of equal width. The top is black, medium red and the bottom are golden. The proportions of the flag are 3:5.
Flag of Germany was adopted in its current form in 1919, but the same flag used the German Confederation from 1815 until 1866. It was re-adopted constitution of 1949.
The origin of the flag colors of Germany not historically determined, and it is thought to bind to or paint on the coat of arms of the Roman-German Empire or the color of the uniforms of German unionists from the time of Revolution in 1848.
Second German Empire and the Nazi regime used a different flag.
The colors of the flag are regulated by the federal Section 22 of the Constitution of Germany, adopted on 23th May 1949, while its proportion of regulated on 7th June 1950.
In addition to the federal flag, in use as the official flag and state authorities and services whose use is regulated by a special decree (Anordnung über die deutschen Flaggen) of 7th June 1950:
The official flag has the same color as the federal flag, moved over to the top of the mast. In the middle and the black and gold section (up to one-fifth the height of the field), there is a federal emblem with an eagle facing the flag mast.
The official flag is a symbol of federal agencies and states may use only the state institutions. German provinces, municipalities, citizens, private institutions or foreign persons or institutions is not allowed to use.