A windjammer is a type of large sailing ship, with an iron or, for the most part, steel hull, built to carry cargo in the nineteenth and early twentieth century. Windjammers were the grandest of merchant sailing ships, with between three and five large masts and square sails, giving them a characteristic profile.A common incorrect explanation of the origin of the term consists of an introduction into English of a folk etymology of the term common in German and Dutch. Both these languages have a word similar to "jam" meaning "to wail" and since speakers of these languages were not aware that the term "windjammer" originally came from English, the folk etymology claims "windjammer" refers to the typical sound of strong winds blowing through the rigging. In fact, the word comes from the English word "to jam" because the sails are so large that they seem to "jam" the wind.The windjammers were cargo ships designed for long voyages. They usually carried bulk cargo, such as lumber, guano, grain or ore from one continent to another, usually following the prevailing winds and circumnavigating the globe during their voyages. Several of these ships are still in existence, variously operating as school ships, museum ships, restaurant ships, and cruise ships.