The only thing that was "special" is that they received a lot of publicity; as they were an enemy (or the enemy). Otherwise, they were like most other submarines, whether they were the US Gato class, British, Japanese, Italian, or Russian.
German submarines fought a war of Guerre de Course, that is Germany pursued a war against merchant shipping (Commerce Raiding). Nations that do not have a traditionally strong battle fleet (battleships & cruisers) will, by necessity, have to fight a war of Guerre de Course.
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U Boats were submarines made and used by Germany in the Second World War to blockade the merchant fleet supplying Britain from America.
U-boats were German.
The "u" stood for "underwater" and the term "u-boats" was and still is used in reference to WWI German submarines.
'U-boats' was the name given to German submarines in both the first and second world war.
U-boat warfare was the German response to the British blockade.
U-boats.