Trenches are long, narrow ditches dug into the ground, often used in military contexts for protection during warfare. They provide soldiers with a safe place to hide from enemy fire and can be connected to form extensive networks. The most famous use of trenches occurred during World War I, where they became a defining feature of the battlefield. In addition to military use, trenches can also be found in construction and agriculture. They are used to lay pipes, cables, or drainage systems. In farming, trenches help manage water flow and prevent soil erosion, making them an important tool for land management.