A stone crusher is a machine designed to reduce large rocks into smaller rocks, gravel, sand, or rock dust. They are essential in various industries, such as construction, mining, and metallurgy, for breaking down raw materials into more manageable sizes for further processing. Stone crushers typically operate by applying mechanical force to break down the material, and they come in various types, including jaw crushers, cone crushers, impact crushers, and hammer crushers, each suited for specific applications and materials.