There are boats and then there are floating mansions. Normal people call them ships because they buy a ticket and go for a cruise for a few days. But, rich people call them yachts because they own them and ten families could live on one.
These are the most expensive yachts in the world though. They are not your average, run of the mill yachts any old millionaire can own. These are the outrageously huge sea vessels billionaires land their helicopters on and have a full crew running everything from the ship’s wheel to the kitchen.