The thinner an object is, the more you can bend it without breaking it. So if you have very thin sheets of wood, they can easily be pressed into a curved shape. If you then glue several of these curved sheets together, the glue will ensure that they keep their shape. That is how most wooden boats are made today, since this material is much more durable and water tight compared to traditional wooden planking.
For traditional boats, they bent the planks into the desired shape using heat and water.
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