A self-propelled howitzer is a type of artillery that combines the features of a traditional howitzer with its own mobility. Unlike towed artillery, which requires a separate vehicle to move it, a self-propelled howitzer has its own engine and tracks or wheels. This allows it to quickly reposition on the battlefield, making it more effective in combat situations. These vehicles are equipped with powerful cannons that can fire shells over long distances. They are often used by military forces to provide indirect fire support, targeting enemy positions from a safe distance. Examples of self-propelled howitzers include the M109 and the PzH 2000.