"Ironclad" refers to a type of warship that was armored with iron or steel plates, making it more resistant to enemy fire. These ships emerged during the mid-19th century, particularly during the American Civil War, where they played a significant role in naval battles. The most famous example is the USS Monitor, which fought the CSS Virginia in 1862, marking a turning point in naval warfare. The introduction of ironclads revolutionized naval design and strategy, leading to the decline of wooden ships. Their robust construction allowed for greater firepower and protection, influencing the development of modern naval vessels. Ironclads paved the way for future advancements in military technology and shipbuilding.