Why did Germany u boat important in world war 1?

Answer 1

The Germans could not invade the British isles, so their best hope was to starve the UK of imported food and weapons, by sinking any ships going to or from Britain. But Britain had a much stronger navy than the Germans, and the Germans would be unlikely to catch up in a traditional naval race, so they had to try an unconventional tactic. U-boats were perfect for this, because they could hide under the seas, where it wouldn't matter how many more ships the British might have on the surface, and then pop up out of nowhere to sink a ship and disappear again.