A bicycle is a simple machine that helps people travel. It has several important parts that work together. To move the bicycle, you push the pedals with your feet. The pedals are connected to a large metal circle. A long chain connects this circle to the back wheel. When you push the pedals, the chain moves. The moving chain turns the back wheel, and the bicycle goes forward. The front wheel is for direction. You use the handlebars to turn the front wheel left or right. Brakes are also very important for safety. They help you stop the bicycle quickly. All these parts must work correctly for a safe ride.