What is bulwark in ship?

A bulwark is a sturdy, protective structure that runs along the sides of a ship, at the level of the upper deck. It is meant to keep water from splashing overboard and to provide protection for the crew against high winds, waves, and other hazards. The bulwark is typically made of steel or other strong materials, and it is designed to be high enough to keep the deck dry and to provide a barrier against the elements. The height and design of the bulwark will vary depending on the type of ship, its intended use, and the conditions it is expected to encounter. In addition to the protective function of the bulwark, it also serves as a platform for tying off ropes, attaching equipment, and loading and unloading cargo.