High-explosive shells are artillery projectiles designed to explode upon impact or at a predetermined distance. They contain a core of explosive material, which is triggered by a fuse. These shells are used in military operations to destroy enemy fortifications, vehicles, and personnel, making them a crucial component of modern warfare. The effectiveness of high-explosive shells lies in their ability to create a powerful blast and shrapnel, causing significant damage over a wide area. They are commonly used in various artillery systems, including howitzers and cannons, and are an essential tool for ground forces in combat situations.