A steamboat sometimes called a steamer, is a boat in which the primary method of propulsion, driving propellers or paddlewheels, is steam power.
Smaller steam-powered boats are used for transportation on lakes and rivers, particularly riverboats where the distances are smaller and cargo less heavy. The term steamship refers to larger steam-powered ships, usually ocean-going, capable of carrying a boat and cargo over long distances.
Steamboats and steamships gradually replaced sailing boats and ships for commercial shipping through the 19th century. With advance in diesel technology, these in turn were replaced by diesel-driven boats and ships in the second half of the twentieth century.
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