Refers to organized activities outside the regular curriculum, such as clubs, sports, and volunteer work, typically in a school context.
大学では課外活動に積極的に参加した。
I actively participated in extracurricular activities at university.
課外活動としてボランティアをしている。
I do volunteer work as an extracurricular activity.
I actively participate in extracurricular activities.
I do volunteer work at school as an extracurricular activity.
This school carries out various extracurricular activities every week.