Floating theater, also known as a SHOWBOAT, is a type of theater that is built on a boat and travels along rivers and other bodies of water. It is a unique form of entertainment that has been around since the 19th century. Showboats were popular in the United States during the 1800s and early 1900s, and they featured a variety of performances such as plays, musicals, vaudeville acts, and more. Today, showboats are still used for entertainment purposes, but they are not as popular as they once were.