An ocean liner is a large passenger ship designed for long-distance travel across oceans. These vessels are built for speed and comfort, often featuring luxurious amenities such as dining rooms, lounges, and cabins. Ocean liners typically operate on fixed routes, connecting major cities and ports. Historically, ocean liners played a crucial role in transatlantic travel, especially before the advent of commercial air travel. Famous examples include the RMS Titanic and the Queen Mary. While their popularity has declined, some ocean liners are still in operation, offering unique cruise experiences for travelers.