More people speak German as their native language than any other language in Europe. It's no wonder, since Germany's 83 million inhabitants make it the most populous European nation. But not only the residents of Germany speak German. It is also an official language of Austria, Switzerland, Luxembourg, and Liechtenstein. And it is the native language of a significant portion of the population in northern Italy, eastern Belgium, the Netherlands, Denmark, eastern France, parts of Poland, the Czech Republic, Russia, and Romania, as well as in other parts of Europe. While learning German can connect you to 120 million native speakers around the globe, remember that many people also learn German as a second language. It is the 3rd most popular foreign language taught worldwide and the second most popular in Europe and Japan, after English
There are series of exams for learners of German as a foreign language (Deutsch als Fremdsprache, DaF) at all levels: A1 up to C2. These can be taken both in Germany and abroad, and have been adapted to fit into the Common European Framework of Reference for Languages (CEFL), the standard for European language testing. There is also one exam, the Großes DEUTSCHs Sprachdiplom, which is at a higher level than the highest CEFL level.