What are the different types of German dumplings and how are they traditionally prepared?

There are several types of German dumplings, including Kartoffelkndel (potato dumplings), Semmelkndel (bread dumplings), and Knoedel (dumplings made with flour or breadcrumbs). These dumplings are traditionally prepared by mixing the main ingredient with eggs, flour, and seasonings to form a dough, which is then shaped into balls or logs and boiled or steamed until cooked. They are often served as a side dish with meat dishes or in soups and stews.