Y class is a term commonly used in the travel and transportation industry, particularly in the context of airline tickets and train bookings. It refers to a specific fare class or ticket class, which designates a particular type of seat or service on a flight or train.

In airlines, the Y class is one of the standard or economy class fare classes. It typically represents the full fare or unrestricted economy ticket, which allows passengers to make changes or cancel their booking without significant penalties. Y class fares are usually the most expensive in the economy class, offering amenities such as complimentary meals and beverages, as well as additional baggage allowance.

Similarly, in train travel, Y class refers to a specific category or type of seating arrangement. The exact features and services provided in the Y class may vary between different train operators or countries. However, it generally indicates an economy or standard class seating, offering basic facilities such as comfortable seats, access to toilets, and sometimes catering services.

Overall, the term "Y class" signifies a fare or ticket class that falls within the economy or standard category, providing a certain level of service and comfort to passengers. It denotes a specific type of seating arrangement or fare type, distinguishing it from other classes available on the same mode of transportation.