noun
Commonly refers to a group of people, but can also be used for other collections.
彼は新しい研究グループに参加した。
He joined a new research group.
グループで話し合ってください。
Please discuss it in your group.
集団 is a more formal or technical term for a collective or mass, often used in sociology or official contexts, while グループ is a casual, everyday word for any kind of group.
班 is often used for organized, smaller units like squads, teams, or class groups in schools, whereas グループ is broader and less structured.
Loanword from English 'group', adopted into Japanese with katakana spelling.