The word "passenger" refers to a person who is traveling in a vehicle, such as a car, train, bus, airplane, or ship, but who is not operating or controlling the vehicle. Passengers are typically traveling from one place to another and are not responsible for the operation or navigation of the vehicle they are traveling in. Passengers may be traveling for various reasons, such as for work, leisure, or personal reasons. In the context of transportation, passengers are a key component and often the reason why the transportation exists in the first place.