Core drills are specialized tools used in construction and geology to create cylindrical holes in various materials, such as concrete, asphalt, and rock. They consist of a hollow drill bit attached to a power source, allowing for efficient extraction of core samples. These samples help in analyzing the material's properties and structure. The core drilling process involves rotating the drill bit while applying pressure to penetrate the surface. This technique is essential for geotechnical investigations, mining, and environmental studies, as it provides valuable information about subsurface conditions without causing significant disruption to the surrounding area.