A full-rigged ship is like a really big boat with lots and lots of sails. You know how you have seen pictures of pirate ships with a big sail in the front and one in the back? A full-rigged ship has a bunch of those sails all over it!
The sails on a full-rigged ship help it move through the water. When the wind blows, it makes the sails puff out and fill up with air. This pushes the ship forward.
But it's not just about having a lot of sails, the sails have to be arranged in a very specific way to make the ship move smoothly. The sails on the main mast, which is usually the tallest one in the middle of the ship, are the biggest and the ones on the smaller masts are a bit smaller.
Sometimes, the sails have to be turned or angled to catch the wind just right, like when you turn an umbrella in the rain so it keeps you from getting wet.
Full-rigged ships were used a long time ago to explore the world and to transport goods from one place to another. They were really important because they could go long distances and carry a lot of stuff. They were also really beautiful to look at and people would often decorate the sails with pictures or designs.