Tank ships, also known as oil tankers, are large vessels used to transport bulk amounts of different types of liquids including petroleum products, chemicals, and liquefied gases. Synonyms for the term "tank ship" include tanker, oil tanker, chemical tanker, gas tanker, liquid carrier, and cargo vessel. These vessels are specifically designed to store and transport hazardous materials and require special safety measures and regulations. Some tankers are equipped with double hulls that provide an extra layer of protection against oil spills and collisions. As international trade continues to grow, the demand for tank ships increases, and new technologies are developed to improve the safety and efficiency of these vessels.