The term "400cc" refers to the engine displacement of a vehicle, typically measured in cubic centimeters (cc). This measurement indicates the total volume of all the cylinders in the engine. A 400cc engine is commonly found in motorcycles, scooters, and some small cars, providing a balance between power and fuel efficiency. In the context of motorcycles, a 400cc engine can deliver enough power for both city commuting and highway riding. It is often seen as an ideal choice for beginner riders, offering manageable performance without being overly powerful, making it suitable for learning and everyday use.