A pile driver is a piece of heavy machinery used in construction to drive piles into the ground. Piles are long, sturdy columns made of materials like wood, steel, or concrete, and they provide support for buildings and other structures. The pile driver works by lifting a heavy weight and then dropping it onto the pile, forcing it deep into the soil. There are different types of pile drivers, including vibratory and impact drivers. The choice of pile driver depends on the soil conditions and the type of piles being used. Proper installation of piles is crucial for the stability of structures like bridges and high-rise buildings.