Caisson piles are large, deep foundation structures used in construction to support heavy loads, especially in areas with soft or unstable soil. They are typically hollow, cylindrical piles that are drilled or sunk into the ground, then filled with concrete to create a sturdy foundation. Caisson piles are often employed in bridge, pier, and offshore construction due to their stability and durability. They can be open-ended to allow water or soil to flow out during installation, or closed-ended for increased structural integrity. Caisson foundations distribute loads to deeper, more stable soil layers, minimizing settlement and enhancing stability.