Sailboat styles can be classified by hull type, use, or sail plan. The types of sailboat hulls include monohulls, catamarans, and trimarans. You can also categorize the kinds of sailboats by their use. For example, sailors use their boats for daysailing, cruising, and racing. Finally, different kinds of sailboats have different sail plans. A sailboat might be a sloop, ketch, yawl, catboat, or schooner.  The term “classes” has a particular meaning in sailing, however. Class racing is the competitive racing between boats of the same make and model—boats of the same “class” or of “one design.” There are hundreds of different classes of sailboats out there. Some of the most popular classes include the Laser and Sunfish classes.