A bicycle generator is a device that converts the mechanical energy produced by pedaling a bicycle into electrical energy. This is typically achieved through a small dynamo or generator attached to the bike, which spins as the wheels turn. The generated electricity can be used to power lights, charge devices, or run other electrical equipment. These generators are often used in commuter bicycles and mountain bikes to provide a sustainable energy source while riding. They are eco-friendly alternatives to battery-powered systems, as they rely solely on human power, making them a popular choice for cyclists who want to reduce their environmental impact.