Used for a school class, a social class, a category, or a class in programming. The exact meaning depends on context.
明日のクラスは何時からですか。
What time does tomorrow's class start?
このクラスには30人の生徒がいます。
There are 30 students in this class.
My son enrolled in an English conversation class.
The whole class prepared for the school festival together.
I was in the same class as her last year too.
This is world-class technology.
parent class; superclass