What is the different between main engine ang auxilliary engine?

The main engine of a vessel is primarily responsible for propelling the ship and is typically larger and more powerful than auxiliary engines. Auxiliary engines provide additional power for onboard systems, such as generators for electricity, pumps, and other machinery. While the main engine operates during navigation, auxiliary engines may function continuously or as needed, depending on the ship's operational requirements. Essentially, the main engine is crucial for movement, whereas auxiliary engines support various operational functions.