The Pacific Theater refers to the area of conflict during World War II that took place in the Pacific Ocean and its islands. It involved major battles between the Allied forces, primarily the United States, and the Axis powers, particularly Japan. The theater included significant events such as the attack on Pearl Harbor, the Battle of Midway, and the island-hopping campaigns. This theater was characterized by naval battles, amphibious assaults, and fierce ground combat on islands like Guadalcanal and Iwo Jima. The conflict ultimately led to the defeat of Japan, culminating in the dropping of atomic bombs on Hiroshima and Nagasaki in 1945, which contributed to Japan's surrender.