1.
after school, after classes
The period of time after classes end for the day. Specifically refers to the time after school dismissal, typically used in the context of elementary through high school.
Usage
放課後 specifically refers to the period after school classes end. It is primarily associated with elementary, middle, and high school contexts — not typically used for university. A culturally significant time in Japanese school life, as many students participate in 部活動 (club activities) during this period.