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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.
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.
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.