Ranging from 80 feet in length up to the staggering 590 feet of AZZAM, the world’s largest private yacht, superyachts can be sailing yachts, motor yachts, motor sailors – or even stylishly-converted tugs or military vessels. In general, yachts are either considered a motor yacht or sailing yacht, depending on how the boat is powered. A sailing yacht is powered by sails or winds, while a motor yacht is powered by engines.