Fahrräder, or bicycles, are two-wheeled vehicles powered by human pedaling. They consist of a frame, wheels, handlebars, and a seat. Bicycles are popular for transportation, recreation, and exercise, offering an eco-friendly alternative to motor vehicles. There are various types of Fahrräder, including Mountainbikes for rough terrains, Rennräder for speed on paved roads, and Stadträder designed for urban commuting. Bicycles can also be equipped with accessories like Lichtern for safety and Gepäckträger for carrying items. Overall, Fahrräder promote a healthy lifestyle and reduce environmental impact.