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It is difficult to classify ships. They are generally made on the same principle - not to sink and because of that they have basically the same parts. Because of that they are classified according to their function. Read more about ships types and classifications.
World’s largest ships are mainly tankers or cargo ships. They are large so they could carry more but their size can present a problem when they can’t enter smaller ports.
Naval vessels are military ships and boats with precise purpose. These vessels improved throughout the history and new ones were invented to serve new demands of modern warfare. Here are some of them.
Merchant vessels come in many sizes depending on their purpose, from 6 meter inflatable dive boats to casino vessels that can take 5,000 passengers. Find out here different types of merchant ships.