Infantry units are military groups primarily composed of soldiers who fight on foot. They are essential for ground combat operations and are trained to engage in various types of warfare, including close combat and urban warfare. Infantry units can vary in size, from small squads to larger battalions, and they often work alongside other military branches, such as artillery and armor. These units are equipped with a range of weapons, including rifles, machine guns, and grenades, allowing them to adapt to different combat situations. Infantry soldiers are also trained in tactics, navigation, and teamwork, making them versatile and crucial for achieving military objectives on the battlefield.