The "dandy horse," also known as the "hobby horse," is an early type of bicycle invented in the early 19th century. It consists of a wooden frame with two wheels and a seat, but it lacks pedals. Riders propel themselves forward by pushing their feet against the ground, similar to running. Invented by Karl Drais in 1817, the dandy horse was a significant step in the development of personal transportation. It paved the way for later innovations in cycling, leading to the creation of bicycles with pedals and other advancements in design and functionality.