Bikes, or bicycles, are two-wheeled vehicles powered by human pedaling. They consist of a frame, handlebars, pedals, and wheels. Bikes come in various types, including road bikes, mountain bikes, and hybrid bikes, each designed for different terrains and riding styles. Riding a bike is a popular form of transportation and recreation. It promotes physical fitness and is an environmentally friendly alternative to motor vehicles. Many cities have bike-sharing programs, making it easier for people to access bikes for short trips. Safety gear, such as helmets, is recommended for riders to reduce the risk of injury.