A quadracycle is like a bicycle with four wheels. Instead of pedals like a normal bike, it is powered by people pedaling together.
It's kind of like when you and your friends push or pull a wagon together, but it's more fun because you can all sit in the wagon and pedal it along like a bike.
It's a great way to exercise and have fun outside with your friends or family. Plus, it's better for the environment since you aren't using any gas or oil to power it – it's all powered by people power!