The phrase "top class" is an adjective used to describe something or someone that is exceptional, superior in quality and belongs to a high standard. It can be applied to various aspects such as education, accommodation, services, performance, etc., when they are of the highest level possible. For example, if you attend a top-class university, it means that the institution provides excellent educational standards, facilities, faculty, and opportunities for its students. Similarly, a top-class hotel or restaurant would offer luxurious amenities, impeccable service, and delicious cuisine to its guests. In summary, "top class" is used as an indicator of excellence in any field or area.