Frankfurt is a metropolis and the fifth-largest city of Germany after Berlin, Hamburg, Munich, and Cologne. By the river Main, a tributary of the Rhine Frankfurt is the second largest Metropolitan region after the Rhine-Ruhr region.
Frankfurt is known to be an alpha world city and is an international center for commerce, culture, education, tourism and transportation. At the city are situated headquarters of many global and corporate companies. Frankfurt Airport is one of the busiest airports of the world. Along that it is a the major financial center of the European continent as the headquarters of the European Central Bank, German Federal Bank, Frankfurt Stock Exchange, Deutsche Bank, DZ Bank, KfW, Commerzbank, several cloud and fintech startups and other institutes.
Frankfurt's DE-CIX is the world's largest internet exchange point. Messe Frankfurt is one of the world's largest trade fairs that happen in the city. Major fairs include the Frankfurt Motor Show, the world's largest motor show, the Music Fair, and the Frankfurt Book Fair, the world's largest book fair.