Bunkers is a common term for marine fuels, which are burned in ships' engines.
Fuel oil is usually used for the main engines which propel the ship. Diesel oils and gasoils are usually used for the auxiliary engines which work lighting, pumps, cranes etc. The annual volume of bunkers supplied is about 140 million tonnes. This activity takes place in nearly every port in the world and in many off shore locations too. Anybody who has an interest in bunkering.