Marine diesel is a type of fuel specifically designed for use in ships and other marine vessels. It is derived from crude oil and is known for its high energy density, making it efficient for powering large engines. Marine diesel engines are commonly used in commercial shipping, fishing boats, and recreational vessels due to their reliability and durability. The use of marine diesel is regulated to minimize environmental impact, with standards set by organizations like the International Maritime Organization (IMO). This fuel type is distinct from regular diesel used in road vehicles, as it often contains additives to enhance performance and reduce emissions in marine applications.