Why were new weapons introduced into the war?

New weapons were introduced into the war to gain a strategic advantage, increase lethality, and adapt to the evolving nature of warfare. Innovations such as tanks, machine guns, and chemical weapons aimed to break the stalemate of trench warfare and improve offensive capabilities. Additionally, advancements in technology and industrial production allowed for the mass production of these weapons, making them more accessible and effective in combat. Ultimately, these new weapons sought to enhance military effectiveness and change the dynamics of battlefield engagements.