Final answer:
U-Boats were submarines used by the German navy to sink enemy ships, while tanks were armored vehicles used to overcome the stalemate of trench warfare and gain a tactical advantage on the battlefield.
Step-by-step explanation:
The purposes of U-Boats and Tanks in WWI were to provide strategic advantages to the German forces.
U-Boats, or Unterseeboots, were submarines used by the German navy to sink enemy ships. They were stealthy and could sneak up on unsuspecting vessels, firing torpedoes to sink them. U-Boats played a significant role in the German naval strategy, disrupting enemy supply lines and attempting to break the British naval blockade of Germany.
Tanks, on the other hand, were armored vehicles used primarily for land combat. They were created to overcome the stalemate of trench warfare and provide mobile firepower and protection. Tanks were utilized to break through enemy lines, provide cover and support to infantry, and gain a tactical advantage on the battlefield.