A mizzenmast is the third mast on a sailing ship, positioned behind the mainmast (the tallest mast in the middle) and the foremast (the mast at the front). On ships with three or more masts, the mizzenmast stands near the stern, or back end, of the vessel.

On large sailing ships, each mast had its own name and purpose. The mainmast carried the largest, most powerful sails. The foremast helped with steering and balance. The mizzenmast, though often shorter than the others, helped stabilize the ship and gave captains more control, especially when making sharp turns or sailing in tricky winds.

Famous ships like the HMS Victory, which fought at the Battle of Trafalgar in 1805, had prominent mizzenmasts. Pirates and naval officers alike relied on these three-masted ships for speed and maneuverability. Today, you'll still see mizzenmasts on traditional sailing vessels and tall ships used for historical sailing demonstrations, though modern ships use engines instead of sails.