Trench warfare is a type of combat where soldiers fight from deep ditches, called trenches, dug into the ground. This method became famous during World War I, as armies faced each other in long, static lines. The trenches provided some protection from enemy fire, but conditions were often harsh, with mud, rats, and disease affecting the soldiers' lives. In trench warfare, battles could last for weeks or months, with little movement. Soldiers would launch attacks, trying to capture enemy trenches, but often faced heavy casualties. This style of warfare highlighted the challenges of modern combat and led to new tactics and technologies in military strategy.