What are gravel bikes and how do they differ from other types of bicycles?

Gravel bikes are a type of bicycle designed for riding on gravel roads and rough terrain. They typically have wider tires, more relaxed geometry, and additional clearance for mud and debris compared to road bikes. Gravel bikes also often have disc brakes for better stopping power and are equipped with mounts for racks and fenders. These features make gravel bikes versatile for various terrains and conditions, distinguishing them from road bikes and mountain bikes.