What feature of windjammers makes them unique from other vessels?

Windjammers are notable for their distinctive number of sails, which sets them apart from other vessels. Typically, a windjammer is a large sailing ship, characterized by its impressive array of sails that allows them to harness wind power efficiently. This feature not only enhances their sailing capability but also contributes to their aesthetic appeal and historical significance in maritime culture.

The emphasis on the number of sails is particularly important, as windjammers often have more sails than many modern vessels, which often rely more on engine power. This characteristic highlights the traditional craftsmanship and sailing prowess associated with windjammers, making them a fascinating subject for both historical and modern sailing enthusiasts. Other options like the use of technology, type of cargo, and size don't capture the essence of what makes windjammers unique, as there are various vessels that may also incorporate similar technologies, cargo types, or sizes.