Double hull refers to a type of ship construction with two watertight walls enclosing the cargo and engine compartments. Similar terms include "twin hull," "dual hull," and "double skin." The use of double hulls has become increasingly common in the shipping industry, as it provides added protection against oil spills and hull breaches. Other synonyms for double hull may include "reinforced hull," "double-layered hull," and "duplex hull." These terms are often used interchangeably, emphasizing the strength and security provided by the additional layer of protection. Regardless of the term used, the implementation of double hulls has become a regulatory requirement in many countries as a precautionary measure to prevent environmental damage.