A "vessel" is a general term used to describe a container that holds liquids or other substances. Common examples include bottles, jars, and cups. In a broader context, vessels can also refer to large watercraft, such as ships and boats, designed for transporting goods or people across bodies of water. In the medical field, a vessel often refers to blood vessels, which are tubes in the body that carry blood. These include arteries, veins, and capillaries, each playing a crucial role in the circulatory system by transporting oxygen, nutrients, and waste products throughout the body.