A parallel-twin engine is a type of internal combustion engine that features two cylinders arranged side by side. This configuration allows for a compact design, making it popular in various applications, including motorcycles and small cars. The cylinders typically share a common crankshaft, which helps in balancing the engine and reducing vibrations. Parallel-twin engines are known for their smooth operation and efficient power delivery. They often produce a good balance of torque and horsepower, making them suitable for both urban commuting and recreational riding. Many manufacturers, such as Kawasaki and Honda, utilize this engine type in their motorcycle models.