A single-cylinder engine is a type of internal combustion engine that has only one cylinder. This design allows for a simpler and lighter engine, making it ideal for small vehicles, motorcycles, and lawn equipment. Single-cylinder engines typically have fewer moving parts, which can lead to easier maintenance and lower production costs. These engines operate by drawing in air and fuel into the cylinder, where they are compressed and ignited to produce power. While single-cylinder engines may not provide as much power as multi-cylinder engines, they are often more fuel-efficient and can be sufficient for lighter applications, such as in motorcycles and small generators.