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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.
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.
We built ships even before we learned how to write history. From the primitive ships that could carry small crew and could not sail far from fear of breaking we today have floating cities that can survive any natural condition and last for years.
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.