A marine engineer is a professional who designs, builds, and maintains the machinery and systems used in ships and other marine vessels. They work on engines, propulsion systems, and electrical systems to ensure that these vessels operate efficiently and safely. Marine engineers often collaborate with other engineers and technicians to solve problems and improve vessel performance. In addition to working on ships, marine engineers may also be involved in offshore structures, such as oil rigs and wind farms. Their expertise is crucial for the shipping industry, naval architecture, and environmental protection, as they help develop technologies that minimize the impact of marine operations on the environment.