A bicycle, commonly referred to as a bike, is a human-powered vehicle that consists of two wheels attached to a frame. Typically, it is propelled by the rider's legs pedaling and is designed primarily for transportation, recreation, and exercise. Bicycles come in various types, including: 1. **Road bikes**: Lightweight bikes designed for speed on paved roads. 2. **Mountain bikes**: Sturdier bikes designed for off-road cycling on rough terrains.
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