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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.
We use ships for thousands of years and they’ve developed in time from three barks that could float on the water to steel ships that can do the same. Here are some interesting facts about ships.
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.