The "J-class" refers to a series of racing yachts built in the early 20th century, specifically designed for the America's Cup competition. These yachts were known for their impressive size, speed, and elegant design, representing the pinnacle of yacht engineering during their time. The J-class boats were typically over 100 feet long and featured sleek lines and large sails, making them both beautiful and powerful on the water. The most famous J-class yachts include Shamrock V, Ranger, and Velsheda. These vessels competed in the America's Cup from 1930 to 1937, capturing the imagination of sailing enthusiasts worldwide. Today, many J-class yachts are preserved and restored, continuing to participate in regattas and showcasing their historical significance in the world of sailing.