It is best known for its professional football team , which plays in the Bundesliga , the top tier of the German football league system .
Is the most successful club in German football history , having won a record 28 national titles and 18 national cups .
It is best known for its professional football team , which plays in the Bundesliga , the top tier of the German football league system , and is the most successful club in German football history , having won a record 28 national titles and 18 national cups .