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 like motorcycles and lawnmowers. The engine operates by igniting a fuel-air mixture in the cylinder, which pushes a piston to create power. Single-cylinder engines are known for their ease of maintenance and lower production costs. They typically produce less power than multi-cylinder engines but are more fuel-efficient for smaller applications. Common examples include small motorcycles and portable generators, where compact size and weight are essential.