Air-cooled refers to a cooling system that uses air to dissipate heat from an engine or other machinery. This method is commonly found in vehicles like motorcycles and some cars, where air flows over the engine components to lower their temperature. The design is often simpler and lighter than liquid-cooled systems, making it a popular choice for smaller engines. In an air-cooled system, fins or other structures may be added to increase the surface area, allowing for more efficient heat transfer. This type of cooling is effective in moderate climates but may struggle in extreme heat, where additional cooling methods might be necessary.