Mariners are individuals who navigate and operate ships or boats on oceans, rivers, and other bodies of water. They are skilled in various tasks, including steering vessels, managing cargo, and ensuring safety at sea. Mariners can work on different types of watercraft, from small fishing boats to large cargo ships. To become a mariner, one typically undergoes training and may obtain certifications, such as a Captain's License or Merchant Mariner Credential. Mariners must also be knowledgeable about maritime laws, weather conditions, and navigation techniques to perform their duties effectively and safely.