noun
A room where classes are held, typically in a school. This is a direct loanword from English, used in Japanese contexts such as language schools or international settings, though 教室 (きょうしつ) is more common in everyday Japanese.
英語のクラスルームは3階にあります。
The English classroom is on the third floor.
クラスルームで日本語を勉強しています。
I'm studying Japanese in the classroom.