A mountain bike is a type of bicycle designed for off-road cycling. It features sturdy frames, wide tires with deep treads, and suspension systems to absorb shocks from rough terrain. Mountain bikes are built to handle various surfaces, including dirt trails, rocky paths, and steep hills, making them popular for outdoor enthusiasts. These bikes come in different styles, such as cross-country, trail, and downhill, each tailored for specific riding conditions. Riders often use mountain bikes for recreational purposes, fitness, or competitive racing. Accessories like helmets and protective gear are recommended for safety while riding.