Bunkers, in the context of the supply chain, refer to the fuel used to power ships and vessels. It includes various types of fuel, such as marine fuel oil and marine diesel oil, that are stored in onboard fuel tanks known as bunkers. Bunkers are essential for the operation of maritime transportation, providing the necessary energy to propel the vessels and support their activities throughout the journey. The term "bunkers" is commonly used to refer to the fuel-related aspects of shipping, including procurement, consumption, and cost considerations.