The "J-Class" refers to a class of racing yachts that were designed for the America's Cup, a prestigious sailing competition. These yachts were built in the 1930s and are known for their sleek lines and impressive size, often exceeding 130 feet in length. The J-Class yachts were specifically created to meet the stringent rules of the competition, which allowed for a combination of speed and elegance. The most famous J-Class yachts include Shamrock V, Ranger, and Velsheda. These vessels are celebrated for their craftsmanship and performance on the water. Today, many J-Class yachts are restored and actively participate in regattas, showcasing their historical significance and the enduring appeal of classic yacht design.