Passenger liners are large ships designed primarily for transporting people across oceans and seas. They offer various amenities, including dining, entertainment, and accommodations, making long journeys comfortable and enjoyable. These vessels can carry thousands of passengers and often travel on set routes, connecting major ports around the world. Many passenger liners are operated by companies like Carnival Cruise Line and Royal Caribbean International. They typically feature multiple decks, swimming pools, and recreational activities. Some liners also provide themed cruises, catering to specific interests such as music, food, or adventure, enhancing the travel experience for guests.