An anchor is a device which provides a mechanism for ships and boats to hold their position. It helps the vessels remain stationary during berthing and mooring at ports, or above an oil deposit.
To provide a pivot, the anchor grips on to any debris or rocks at the bottom of the sea. It can stabilize the vessel against waves during unfavorable conditions (like storms) and hence preventing bow slamming and green water loading. Green water refers to any water on the upper deck of the ship. Bow slamming is the result of the collision between water and the ship’s body because of its motion.